Question

The table below contains data about the cost of electricity during a recent month for a random sample of 30 ​one-bedroom apartments in a large city. Complete parts​ (a) through​ (c) below.

​ 94 161 139 94 109 174 185 149 164 124 198 90 205 147 182 177 117 177 159 153 147 174 122 129 114 102 110 128 141 135 a. Construct a frequency distribution and a percentage distribution that have class intervals with the upper class boundaries​ $99, $119, and so on.

a. Construct a frequency distribution and a percentage distribution that have class intervals with the upper-class boundaries $99, $119, and so on.

Construct a frequency distribution.	Cost ($)			Frequency
	80	but less than	100
	100	but less than	120
	120	but less than	140
	140	but less than	160
	160	but less than	180
	180	but less than	200
	200	but less than	220

Construct a percentage distribution.	Cost ($)			Percentage
	80	but less than	100	%
	100	but less than	120	%
	120	but less than	140	%
	140	but less than	160	%
	160	but less than	180	%
	180	but less than	200	%
	200	but less than	220	%
	(Round to two decimal places as needed.)

b. Construct a cumulative percentage distribution.	Cost ($)	Percentage Less Than Indicated Amount
	80	%
	100	%
	120	%
	140	%
	160	%
	180	%
	200	%
	220	%
	(Round to two decimal places as needed.)

c. Around what amount does the monthly electricity cost seem to be concentrated? Choose the correct answer below.

A.Between

$140

and

$200

B.Between

$80

and

$140

Your answer is not correct.

C.Between

$160

and

$220

D.Between

$120

and

$180

This is the correct answer.

E.Between

$100

and

$160

Answer 1

Below is a frequency distribution, percentage distribution and cumulative percentage distribution table

Class Intervals	Tally	Frequency	Relative Frequency	Percentage Distribution	Cumulative percentage distribution.
80-99	|||	3	3/30	10%	10%
100-119	|||||	5	5/30	16.6667%	26.6667%
120-139	||||||	6	6/30	20%	46.6667%
140-159	||||||	6	6/30	20%	66.6667%
160-179	||||||	6	6/30	20%	86.6667%
180-199	|||	3	3/30	10%	96.6667%
200-219	|	1	1/30	3.3333%	100%

The monthly electricity cost seem to be concentrated between amount $120 and $180 ,because it has highest number of frequencies.