The number of hours per day a college student spends on homework has a mean of 6 hours and a standard deviation of 1.25 hours. Yesterday she spent 3 hours on homework. How
Many standard deviations from the mean is that? Round your answer to two decimal places.
A)1.20 standard deviations below the mean
B)1.20 standard deviations above the mean
C)2.40 standard deviations below the mean
D)2.40 standard deviations above the mean

Question

Quizplus · Accepted Answer

To find how many standard deviations from the mean the student's homework time is, use the formula: (observed value - mean) / standard deviation = (3 - 6) / 1.25 = -3 / 1.25 = -2.40. This means the student's time spent on homework was 2.40 standard deviations below the mean.

The Number of Hours Per Day a College Student Spends