What is the age distribution of adult shoplifters (21 years of
age or older) in supermarkets? The following is based on
information taken from the National Retail Federation. A random
sample of 895 incidents of shoplifting gave the following age
distribution. Estimate the mean age, sample variance, and sample
standard deviation for the shoplifters. For the class 41 and over,
use 45.5 as the class midpoint. (Round your answers to one decimal
place.)
Age range
(years)
21-30
31-40
41 and over
Number of
shoplifters
276
350
269
x
=
s2
=
s
=