Carl's Candies has determined that a candy bar measuring 3 inches long has a z-score of + 1 and a candy bar measuring 3.75 inches long has a z-score of + 2. What is the standard deviation of the length of candy bars produced at Carl's Candies?

0.75 inches

Step-by-step explanation:

The value that has z=2 is 2 standard deviations from the mean. The value that has z=1 is 1 standard deviation from the mean. The difference between these two values is 1 standard deviation:

1 standard deviation = 3.75 in - 3 in = 0.75 in