American Demographics reports the age distribution of consumers who bought tabloid newspapers / magazines during the past year

*To simplify your calculations, assume the last age group is 65 to 80. The intervals are not all the same width.
a. Draw the corresponding histogram.
b. Estimate the mean, the variance and the standard deviation of tabloid purchaser ages.

Transcribed Image Text:

AGE 18 to under 25 25 to under 35 35 to under 45 45 to under 55 55 to under 65 65 and over Midpoint 21.5 30 Proportion 147 194 256 170 101 132 60 72.5