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 studentʹs textbook expenditure.
A)-3
B)+2
C)+3
D)-2

Question

Quizplus · Accepted Answer

The z-score is calculated using the formula z = (X - μ) / σ, where X is the value in question, μ is the mean, and σ is the standard deviation. Substituting the given values: z = (700 - 500) / 100 = 200 / 100 = +2.

The Amount Spent on Textbooks for the Fall Term Was