The probability distribution for the number of automobiles sold during a day (x) at Bob Iron Motors is as follows.   x f(x) 0 0.001 1 0.007 2 0.034 3 0.099 4 0.188 5   6 0.220 7 0.136 8 0.055 9 0.015 10 0.001   22 The variance of number of automobiles sold is, a 2.291       b 2.362       c 2.435       d 2.511

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