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Question: The file Utility contains the electricity costs,


The file Utility contains the electricity costs, in dollars, 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

Decide whether the data appear to be approximately normally distributed by
a. comparing data characteristics to theoretical properties.
b. constructing a normal probability plot.

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