The diameter of small Nerf balls manufactured overseas is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inches. Suppose a random sample of 20 balls is selected. Find the interval that contains 95.44 percent of the sample means.
A) [5.04, 5.36]
B) [5.18, 5.22]
C) [5.16, 5.24]
D) [5.07, 5.33]

Question

Quizplus · Accepted Answer

5.2 ± 2(.018) = 5.2 ± .036 = [5.164, 5.236]

The Diameter of Small Nerf Balls Manufactured Overseas Is Expected