Question

Below is a frequency distribution for the estimated miles per gallon (MPG) for 530 different models of American-made cars.

American-Made Cars
MPG	Frequency
7 - 12	57
13 - 18	177
19 - 24	167
25 - 30	77
31 - 36	40
37 - 42	12

(a) Identify the following

class midpoints (enter as a comma-separated list)

class boundaries (enter as a comma-separated list)

class width

(b) Create a relative frequency table from the frequency table.

American-Made Cars
MPG	Relative Frequency
7 - 12	%
13 - 18	%
19 - 24	%
25 - 30	%
31 - 36	%
37 - 42	%

(c) Create a cumulative and relative-cumulative frequency table.

American-Made Cars
MPG	Cumulative Frequency	Relative Cumulative Frequency
less than 12.5		%
less than 18.5		%
less than 24.5		%
less than 30.5		%
less than 36.5		%
less than 42.5		%

(d) Estimate the mean MPG for the American-made cars included in this set.

Answer 1