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7 January, 20:57

During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 99% of the households spent less than what amount?

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  1. 8 January, 00:22
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    Given X~Normal (mean=8.22, s=1.1)

    So P (5
    =P (-2.93
    =0.7595 (check standard normal table)
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