A grouped frequency distribution has a mean of 200 and a standard deviation of 20. The class limits for one class are 220 up to 240. Based on the normal distribution, what is the probability that an observation would be in this class?
A) 0.1359
B) 0.3413
C) 0.4772
D) 0.8185

Question

Quizplus · Accepted Answer

The z-scores for 220 and 240 are 1 and 2, respectively. The probability between these z-scores is approximately 0.1359.

A Grouped Frequency Distribution Has a Mean of 200 and a Standard