MATH 225N WEEK 5 LAB ASSIGNMENT 2026
PRACTICAL LAB INTERPRETATION SET
◉ On average, Sean has noticed that 18 trains pass by his house
daily (24 hours) on the nearby train tracks. What is the probability
that at most 5 trains will pass his house in a 10-hour time period?
(Round your answer to three decimal places.) Answer: 0.241
◉ Gail averages 153 points per bowling game with a standard
deviation of 14.5 points. Suppose Gail's points per bowling game are
normally distributed. Let X= the number of points per bowling game.
Then X∼N(153,14.5).
If necessary, round to three decimal places. Answer: Suppose Gail
scores 108 points in the game on Thursday. The z-score when x =
108 is −3.103. The mean is 153.
This z-score tells you that x = 108 is 3.103 standard deviations to the
left of the mean.
◉ Given the plot of normal distributions A and B below, which of the
following statements is true? Select all correct answers. Answer: B
has the larger mean.
A has the larger standard deviation.
