Questions
1. Find the mean of:
4, 7, 8, 9, 12
2. Find the median of:
3, 5, 7, 11, 13, 15
3. A die is rolled once. Find:
P
(even)
4. Two fair coins are tossed. Find:
P
(exactlyonehead )
5. A bag contains 5 red and 3 blue balls. Find:
P
(blue)
6. State the mode:
5, 7, 5, 8, 9, 5, 10
7. Find the range:
12, 18, 7, 23, 16
8. If
P
(
A
)=0.6
,P
(
B
)=0.4
and A and B are independent, find:
P
(
A ∩ B
)
9. A discrete variable takes values 1,2,3 with probabilities 0.2, 0.5,
0.3. Find
E
(
X
)
.
10. Calculate the variance of:
2, 4, 6
Answers
1. 8
2. 9
3.
1
2
4.
1
2
