The shelf life of a high-speed photographic film is being investigated by the manufac turer. The following data are available (in days). 126 129 134 141 131 132 136 145 116 128 130 162 125 126 134 129 134 127 120 127 120 122 129 133 125 111 147 129 150 148 126 140 130 120 117 131 149 117 143 133 (a) Construct a histogram and comment on the properties of the data. (b) Consider the quantity (c) Now consider the quantity (i - a)². For what value of a is this minimized? 1 ₁ - al. What value of a that minimizes this?

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