Question

1. A researcher has collected the below data on the cost of electricity during a recent month from a random sample of 30 one-bedroom apartments in a large city:

95 163 142 94 109 172 181 149 164 123 205 90 205 152 187 178 118 177 160 152 149 171 125 131 116 102 111 126 146 134

A. Construct a frequency distribution table and a percentage distribution table that have class intervals with the upper class boundaries of $99, $119, and so on until $219 (e.g. the intervals to use should look like this:

greater than equal to 80 but less than 100

greater than equal to 100 but less than 120

greater than equal to 120 but less than 140 …

greater than equal to 200 but less than 220).

B. Around what interval does the monthly electricity cost seem to be concentrated?

Answer 1