Here is data showing electricity costs in dollars during August 2010 for a random sample of 50 apartments in a large city

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?

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