Download Math 101: Percentages Questions and Answers and more Exams Mathematics in PDF only on Docsity!
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What is one way to use percentages? A. Percentages can be used to describe a change in something. For example, out of 3,000 employees, 15% got raises. B. Percentages can be used to describe a change in something. For example, the shoes are 50% lighter, but are 17% more expensive. C. Percentages can be used to express a fraction of something. For example, a company started with 15, employees and has grown 3% within the past year. D. Percentages can be used to express a fraction of something. For example, out of 15,000 employees, 3% lost their jobs. - correct answer D What is a second way to use percentages? A. Percentages can be used to describe a change in something. For example, out of 34 students, 50% passed the test.
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B.
Percentages can be used to compare two things. For example, out of 945 residents, 80% voted in the last election. C. Percentages can be used to compare two things. For example, the stock dropped 1.5% this past week. D. Percentages can be used to describe a change in something. For example, the cost of milk rose 5% within the past month. - correct answer D What is the third way to use percentages? A. Percentages can be used to compare two things. For example, the car costs 25% more but gets 10% more miles per gallon. Your answer is correct.B. Percentages can be used to express a fraction of something. For example, this class scored 10% better, but took 50% longer. C.
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The key word 'more than' is used to express the relative change between the referenced value and the compared value. The key word 'of' is used to express the ratio of the compared value to the referenced value. Your answer is correct.D. The key word 'more than' is used to express the ab - correct answer C How are their meanings related? A. If the compared value is P% of the reference value, it is (100minusP)% more than the reference value. B. If the compared value is P% more than the reference value, it is (100plusP)% of the reference value. Your answer is correct.C. If the compared value is P% more than the reference value, it is (100minusP)% of the reference value. D. If the compared value is P% of the reference value, it is (100plusP)% more than the reference value. - correct answer B
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Decide whether the following statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain your reasoning. My older child weighs 25% more than my younger child. Choose the correct answer below. A. The statement makes sense because if the older child weighs 25% more than the younger child, then his weight is 0.75 times the younger child's weight, which is possible. B. The statement does not make sense because if the older child weighs 25% more than the younger child, then his weight is minus1.25 times the younger child's weight. This cannot be true because the weight is never negative. C. The statement makes sense because if the older child weighs 25% more than the younger child, then his weight is 1.25 times the younger child's weight, which is possible. Your answer is correct.D. The statement does not make sense because if the older child w - correct answer C
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We found that these rare cancers were 700% more common in children living near the toxic landfill than in the general population. Choose the correct answer below. A. The statement does not make sense because the number of rare cancers found in the general population is 7 times the number of rare cancers found in children living near the toxic landfill, which does not make sense. B. The statement makes sense because the number of rare cancers found in children living near the toxic landfill is 7 times the number of rare cancers found in the general population, which is possible. C. The statement makes sense because the number of rare cancers found in children living near the toxic landfill is 8 times the number of rare cancers found in the general population, which is possible. Your answer is correct.D. The statement does not make sense because the number of rare cancers found in the general population is - correct answer C
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The rate of return on our fund increased by 50%, to 15%. Choose the correct answer below. A. The statement does not make sense because if the rate of return on our fund increased by 50%, to 15%, then the previous rate is minus35%, which does not make sense. B. The statement makes sense because if the rate of return on our fund increased by 50%, to 15%, then the previous rate is 10%, which makes sense. Your answer is correct.C. The statement makes sense because if the rate of return on our fund increased by 50%, to 15%, then the previous rate is 7.5%, which makes sense. D. The statement does not make sense because if the rate of return on our fund increased by 50%, to 15%, then the previous rate is 65%, which does not make sense. - correct answer B Express the given percentage as a reduced fraction and a decimal. 220 %
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24 pounds of recyclable trash in a barrel of 54 pounds of trash - correct answer 44.4% In the following statement, express the first number as a percentage of the second number. The full-time year-round median salary for U.S. men in 2010 was $41 comma 800, and the full-time year-round salary for U.S. women in 2010 was $34 comma 300. - correct answer 121.9% Find the absolute change and the percentage change in the following case. The number of daily news paper in a country was 2149 in 1900 and 1313 in 2010. - correct answer Absolute Change: - 1313-2149= - Percentage Change: - -836/ x The gestation period of horses (336 days) is _____ percent longer than the gestation period of lions (108 days). - correct answer 211.
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108-336= then / Fill in the blank. Will is 23% taller than Wanda, so Will's height is ____% of Wanda's height. - correct answer 123% The wholesale price of a TV is 55% less than retail price. Therefore, the wholesale price is _____ times the retail price. - correct answer 0. 100-55= 45/ The sales tax rate in a city is 8.7%. Find the tax charged on a purchase of $268, and the total cost. - correct answer How much tax is charged on a purchase of $ ? 23. Sales Taxequals Sales Tax Rate times Purchase Price Tequals8.7% times $ Tequals48.7 times 0.01 times $ Tequals0.087 times $
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Choose the correct answer below. A. The claim could be true because her new monthly energy bill would be 82% of the previous monthly energy bill, which makes sense. B. The claim could not be true because her new monthly energy bill would be minus18% of the previous monthly energy bill. This is impossible since the bill cannot be negative. Your answer is correct.C. The claim could not be true because her new monthly energy bill would be minus82% of the previous monthly energy bill. This is impossible since the bill cannot be negative. D. The claim could be true because her new monthly energy bill would be 18% of the previous monthly energy bill, which makes sense. - correct answer B What are significant digits? A.
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Significant digits are the digits that occur in a result because of random and inherently unpredictable events in the measurement process. B. Significant digits are the digits in a number that represent actual measurements and therefore have meaning. Your answer is correct.C. Significant digits are the digits that describe how closely the measurement approximates the true value. - correct answer B How can you tell whether zeros are significant? A. The position of zeros in a number with respect to the position of the nonzero numbers in a number is what determines the significance of zeros. Your answer is correct.B. Trailing and leading zeros are never significant, where as zeros contained between nonzero digits are always significant. C. Zeros are never significant.
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Give an example in which the absolute error is large but the relative error is small. A. A runner's true weight is 125 pounds, but a scale says he weighs 130 pounds. B. A chemist has 2.9 mg of substance, but a scale measures 2.1 mg. C. A census says that the population of a town is 72,453, but the true population is 96,000. D. A company projects sales of $7.30 billion and true sales turn out to be $7.32 billion. - correct answer D Give an example in which the absolute error is small but the relative error is large. A. A chemist has 2.9 mg of substance, but a scale measures 2.1 mg. Your answer is correct.B.
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A runner's true weight is 125 pounds, but a scale says he weighs 130 pounds. C. A census says that the population of a town is 72,453, but the true population is 96,000. D. A woman weighs 102.4 pounds. The scale at the gym says she weighs 102.7, but the scale at the doctor's office says she weighs 102one fourth
. - correct answer A Why can it be misleading to give measurements with more precision than is justified by the measurement process? Choose the correct answer below. A. It is misleading because the measurement would be perceived as having a greater amount of detail than it actually has. Your answer is correct.B. It is misleading because the measurement would be perceived as having a lesser amount of detail than it actually has.
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measurement will not be precise to the nearest micrometer. - correct answer C A $1 million error may sound like a lot, but when compared to our company's revenue it represents a relative error of only 0.1%. Choose the correct answer below. A. The statement does not make sense because the relative error is low. Thus, the $1 million dollar error is not very big when compared with the actual revenue. B. The statement makes sense because the relative error is high. Thus, the $1 million dollar error is very big when compared with the actual revenue. C. The statement does not make sense because the relative error is high. Thus, the $1 million dollar error is very big when compared with the actual revenue. D. The statement makes sense because the relative error is low. Thus, the $1 million dollar error is not very big when compared with the actual revenue. - correct answer D
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State the number of significant digits and the implied precision of the given number. 2772 dollars per acre - correct answer 4 State the number of significant digits and the implied precision of the given number. 1.296 times 10 Superscript 4 seconds - correct answer 4 Carry out the indicated operation and give your answer with the specified number of significant digits. 43 times 32.1; 3 significant digits - correct answer 1380 Carry out the indicated operation and give your answer with 2 significant digits. 245.78 divided by 0. What is 245.78 divided by 0.028 with two significant digits? - correct answer 8, Describe possible sources of random and systematic errors in the following measurement.
