Question

students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54. Treating this class as the population, what percent of students study more than 12 hours a week

Answer 1

Use z-scores.

Formula:
z = (x - mean)/sd

Once you have the z-score, use the z-table to find the probability. Convert to a percentage.

Answer 2

ddf

Answer 3

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