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Math Help - combining binomial & normal distribution

  1. #1
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    combining binomial & normal distribution

    if 4 items are chosen at random, what is the probability that their average length is greater than 35cm.
    mean = 35.05cm
    std dev = 0.2

    i know that the probability of 1 item greater than 35cm is 0.5987 but unsure how to include 4 items and find mean? maybe binomial?
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  2. #2
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    Quote Originally Posted by john1985 View Post
    if 4 items are chosen at random, what is the probability that their average length is greater than 35cm.
    mean = 35.05cm
    std dev = 0.2

    i know that the probability of 1 item greater than 35cm is 0.5987 but unsure how to include 4 items and find mean? maybe binomial?
    Read this: Sample Means
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