[20]Normal probability density

Normal probability density function The score on a test have a mean of 50 and a standard deviation of 5. Assume the variable is normally distributed. (a)If a personnel manager wishes to select from the top 10% of applicants who take the test, find the cutoff score. (b)What is the probability that a randomly... 顯示更多 Normal probability density function

The score on a test have a mean of 50 and a standard deviation of 5. Assume the variable is normally distributed.
(a)If a personnel manager wishes to select from the top 10% of applicants who take the test, find the cutoff score.
(b)What is the probability that a randomly selected applicant will score between 40 and 45.

Standard Normal Distribution Table:
http://i.imgur.com/QYB4asD.png
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