A small computing center has found that the number of jobs submitted per day to its computers has adistribution that is approximately bell shaped, with a mean of 84 jobs and a standard deviation of 10. Where dowe expect most (approximately 95%) of the distribution to fall?
A) between 64 and 104 jobs per day
B) between 74 and 94 jobs per day
C) between 54 and 114 jobs per day
D) between 64 and 114 jobs per day

Question

Quizplus · Accepted Answer

The 95% confidence interval for a bell-shaped (normal) distribution is given by the mean plus or minus two standard deviations. Therefore, 84 ± 2(10) = 64 to 104 jobs per day.

A Small Computing Center Has Found That the Number of Jobs