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    kunmi Posts: 2, Reputation: 1
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    Nov 5, 2012, 03:57 PM
    statistics
    The amount of time required for an oil and filter change on an automobile is normally distributed
    with a mean of 45 minutes and a standard deviation of 10 minutes.
    1)If a random sample of 16 cars is selected,
    a)What sample size is needed in order for the standard deviation of the mean to be one fifth of the population standard deviation?

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