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31 August, 11:53

If the age distribution of customers at a major retail chain is thought to be bell-shaped with a mean equal to 43 years and a standard deviation equal to 7 years, the percentage of customers between the ages of 29 and 57 years is:

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  1. 31 August, 13:18
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    Around 95%

    Explanation:

    If the customer population follows a bell-shaped distribution, it means that the age distribution is normal.

    For normal populations, around 95% of elements are within two standard deviations from the mean.

    In this case, two standard deviations would be:

    43+14 = 57

    43-14 = 29

    Therefore, the percentage of customers who are between 57 and 29 years of age is around 95%.
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