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4 July, 02:53

The monthly amounts spent for food by families of four receiving food stamps approximates a symmetrical, normal distribution. The sample mean is $150 and the standard deviation is $20. Using the Empirical rule, about 95% of the monthly food expenditures are between what two amounts?

A. $205 and $220

B. $85 and $105

C. $100 and $200

D. $110 and $190

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  1. 4 July, 04:36
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    correct answer comes out to be option D

    Step-by-step explanation:

    sample mean (μ) = $150

    standard deviation (σ) = $20

    for about 95% of monthly food expenditure are between

    = μ - 2 σ, μ + 2 σ

    = $150 - 2 * $20, $150 + 2 * $20

    = $110, $ 190

    so, the range comes out to be in between $110 and $ 190.

    Hence, the correct answer comes out to be option D.
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