Answer to Question #167422 in Statistics and Probability for Sandra

Question

a studied ,the average number of the heirs bond for the senior high school students for their online classes a week is 24 hours with a standard deviation of 4 hours .as shown in the study is true and a data is normally distributed

A. find the probability that a randomly selected senior high school students spend more than 26 our but less than 20 hours and

B

find the probability that a randomly selected senior high school students spend less than 21 hours or greater than 30 hours

C. Find the probability that a random sample of 12 senior highschool students spends more than 24 hours.

Answer 1

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