1 P z395 2 let z denote a standard normal random variable Fi

1) P (z>3.95)

2) let z denote a standard normal random variable. Find P (z<-0.87)

3) If a standard normal random variable, then P (-1.25 <=Z <=-0.75) is

4) The distribution of scores for the third exam in a statistics course has a mean of 74 and a standard deviation of 15. A random sample of 36 exam papers is selected. What is the probability that the sample mean is higher than 77?

5) The distribution of IQ scores for high school graduates is normally distributed with mean mu=104 and standard deviation sigma=16. What is the probability of the IQ scores would be between 97 and 126.

please show how you got the answer. working on practice exam.

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