The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean expenditure was calculated to be $500 and the standard deviation of the expenditures was calculated to be $100. Suppose a randomly selected student reported that their textbook expenditure was $700. Calculate the z-score for this student's textbook expenditure.
A) -2
B) -3
C) +2
D) +3

Question

Quizplus · Accepted Answer

The z-score is calculated using the formula: z = (X - μ) / σ, where X is the value, μ is the mean, and σ is the standard deviation. Here, z = (700 - 500) / 100 = +2.

The Amount Spent on Textbooks for the Fall Term Was