February 23, 2017

Homework Help: statistics

Posted by Gerard on Tuesday, July 20, 2010 at 6:55pm.

1.On a test the mean is 75 and the standard deviation is 5.
A. What is the probability that a randomly selected score is higher than 80?
B. What percentage of the students scored higher than 80?
C. What percentage of the scores were less than 68?
D. What score separates the top 20% from the rest?
E. What score separates the bottom 15% from the rest?
F. If a set of 32 students are selected, what is the probability that the sample mean is less than 77?

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