Faculty in the psychology department at State University consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. How many cups of coffee would an individual at the 25th percentile drink per day?
A)4
B)5
C)6
D)7

Question

Faculty in the psychology department at State University consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. How many cups of coffee would an individual at the 25th percentile drink per day?​
A)4
B)5
C)6
D)7

Quizplus · Accepted Answer

The 25th percentile corresponds to a z-score of approximately -0.675. Using the formula X = μ + Zσ, where μ = 5 and σ = 1.5, we calculate X = 5 + (-0.675)(1.5) = 4.9875, which rounds to 4 cups.

Faculty in the Psychology Department at State University Consume an Average