question archive 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
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
Subject:StatisticsPrice:2.86 Bought8
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.
98
164
143
97
110
169
187
150
161
123
202
92
206
151
185
177
120
179
156
150
147
175
121
127
114
104
111
129
140
138
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
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To construct the frequency distribution we just need to count the observations falling under each class. For example 92, 97 and 98 are more than 80 but less than 100 so there are 3 values falling in between 80 and 100. So the class "80 but less than 100" frequency 3.
Similarly, 104, 110, 111 and 114 are more than equal to 100 but less than 120 so there are 4 observations in the class "100 but less than 120" indicating that this class has frequency of 4.
This way the complete frequency distribution is calculated. The table is attached below.
Cost? ($) Frequency 80 but less than 100 3 100 but less than 120 4 120 but less than 140 6 140 but less than 160 7 160 but less than 180 6 180 but less than 200 2 200 but less than 220 2 Total 30
