คุณเก่งสถิติแค่ไหน โดย Inkwer ( ควิซทดสอบ )

1 You are given P[A∪B] = 0.7 and P[A∪B′] = 0.9 . Determine P[A] .

0.3

0.6

0.4

0.8

0.2

2 A policyholders are three times as likely to file two claims as to file four claims.If the number of claims filed has a Poisson distribution, what is the variance of the number of claims filed?

4

1

1/Square root of 3

Square root of 2

2

3 Suppose the mean on the final exam is 24 (of 40), with a standard deviation of 1.5. If you get a 21, how well do you do (relative to the rest of the class)?

very poorly--perhaps the lowest score

nicely--better than the median

OK--about average

not well, but somewhere in the C's

4 A list of 5 pulse rates is: 70, 64, 80, 74, 92. What is the median for this list?

78

72

75

74

76