Scores on recent national statistics exam-standard deviation

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Reference no: EM13321877

Scores on a recent national statistics exam were normally distributed with a mean of 62 and a standard deviation of 4.

a. What is the probability that a randomly selected exam will have a score of at least 55?

b. What percentage of exams will have a score of 74?

c. What percentage of exams will have scores between 56 and 72?

d. What percentage of exams will have scores less than 66?

e. If the bottom 1% of students received failing scores, what is the highest failing score?

Reference no: EM13321877

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