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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 $253 and $1,025.
(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 $830 per year on household supplies?
(d) What proportion of households spend more than $1,260 per year on household supplies?
(e) What proportion of households spend between $330 and $470 on household supplies?
(Round your answers to 4 decimal places.)
(a) Standard deviation =
(b) Height =
(c) P(x > 830) =
(d) P(x > 1,260) =
(e) P(330 < x < 470) =
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