According to the U. S. Department of Labor, the average American household spends $639 on household supplies per year. Suppose annual expenditures on household supplies per household are uniformly distributed between the values of $261 and $1,017. (a) What is the standard deviation of this distribution? (b) What is the height of this distribution? (c) What proportion of households spend more than $900 per year on household supplies? (d) What proportion of households spend more than $1,220 per year on household supplies? (e) What proportion of households spend between $330 and $510 on household supplies?
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