2.38 The file Utility contains the following data about the cost of electricity during July of a recent year for a random sample of 50 one-bedroom apartments in a large city:

96 171 202 178 147 102 153 197 127 82

157 185 90 116 172 111 148 213 130 165

141 149 206 175 123 128 144 168 109 167

95 163 150 154 130 143 187 166 139 149

108 119 183 151 114 135 191 137 129 158

a. Construct a histogram and a percentage polygon.

b. Construct a cumulative percentage polygon.

c. Around what amount does the monthly electricity cost seem to be concentrated?