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    theigh1hnder's Avatar
    theigh1hnder Posts: 1, Reputation: 1
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    #1

    Jan 23, 2008, 06:12 PM
    z-score and probability distrbution
    if the mean age of retirees from the teaching proffession is 57 years old with a standard deviation of 5.6, find the minimum sample size so that the probability that sample mean exceeds 55 years is .6
    So me all steps and how u calculated this please I need help
    RickJ's Avatar
    RickJ Posts: 7,762, Reputation: 864
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    #2

    Jan 23, 2008, 06:23 PM
    <Moved from Introductions to Math & Sciences>
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