62.171 Introductory Statistics
Lab Assignment 5
Page 2 of 3
Question 2:
The number of pieces of mail received daily at the school office is normally distributed with mean
u = 100.33 pieces per day and standard deviation o = 25.55 pieces per day.
Use the 68-95-99.7 Rule to compute the values in Parts (a) and (b).
(a) Between what two values do the middle 95% of daily mail delivery amounts fall?
(b) Give the value such that only 2.5% of days have more mail delivery than that day's value.
