Exhibit 6-7
The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces.
-Refer to Exhibit 6-7. What is the probability that a randomly selected item will weigh between 11 and 12 ounces?
A)0.4772
B)0.4332
C)0.9104
D)0.0440

Question

Quizplus · Accepted Answer

The Z-scores for 11 and 12 ounces are 1.5 and 2, respectively. The probability between these Z-scores is found by subtracting the cumulative probability at Z=1.5 from that at Z=2, which is approximately 0.9772 - 0.9332 = 0.0440.

Exhibit 6-7 The Weight of Items Produced by a Machine Is Normally