A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is approximately mound-shaped and symmetric, with a mean of 85 jobs and a standard deviation of 5. Where do we expect approximately 95% of the distribution to fall?
A) between 70 and 100 jobs per day
B) between 75 and 95 jobs per day
C) between 95 and 100 jobs per day
D) between 80 and 90 jobs per day

Question

Quizplus · Accepted Answer

According to the empirical rule (68-95-99.7 rule) for a normal distribution, approximately 95% of the data falls within two standard deviations of the mean. Here, the mean is 85 and the standard deviation is 5, so 95% of the distribution falls between 75 (85-2*5) and 95 (85+2*5) jobs per day.

A Small Computing Center Has Found That the Number of Jobs