The average number of average number of hours per day a university student spends on homework is 5 hours with a standard deviation of 1.25 hours.How many standard deviations from the mean is 2 hours spent on homework?
A)2.40 standard deviations below the mean
B)1.20 standard deviations below the mean
C)2.50 standard deviations above the mean
D)1.20 standard deviations above the mean
E)2.40 standard deviations above the mean

Question

Quizplus · Accepted Answer

To find how many standard deviations from the mean 2 hours is, use the formula: (X - μ) / σ, where X is 2 hours, μ (mean) is 5 hours, and σ (standard deviation) is 1.25 hours. This calculation gives (2 - 5) / 1.25 = -3 / 1.25 = -2.4, indicating 2.40 standard deviations below the mean.

The Average Number of Average Number of Hours Per Day