The mean price of a pound of ground beef in 75 cities in the Midwest is $2.11 and the standard deviation is $0.56. A histogram of the data shows that the distribution is symmetrical. A local Midwest grocer is selling a pound of ground beef for $3.25. What is this price in standard units? Assuming the Empirical Rule applies, would this price be unusual or not? Round to the nearest hundredth.
A)z = 2.04; This price would not be unusual.
B)z = - 2.04; This is unusually inexpensive ground beef.
C)z = 2.04; This is unusually expensive ground beef.
D)z = - 2.04; This price would not be unusual.

Question

Quizplus · Accepted Answer

The z-score is calculated as (3.25 - 2.11) / 0.56 = 2.04. According to the Empirical Rule, a z-score above 2 is considered unusual, indicating the price is unusually expensive.

The Mean Price of a Pound of Ground Beef in 75