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Suppose the scores on a reading ability test are normally distributed with a mean of 65...

Suppose the scores on a reading ability test are normally distributed with a mean of 65 and a standard deviation of 8.

A) If one student is chosen at random, what is the probability that the student's score is greater than 81 points"?

B) If 500 students took the reading ability test HOW MANY students would expect to earn a score greater than 81 points?

c) Find the probability of randomly selecting 35 students (all from the same class) that have a sample mean reading ability test score between 66 and 68.

Math   Statistics-And-Probability   
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