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Math Help - normal dis with multiple items

  1. #1
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    normal dis with multiple items

    Question
    height of one row = mean = 20.00cm
    std dev = 0.25cm

    if a wall has 10 rows (i.e. 10* 20cm = 200cm)
    1) what is the distribution of the height?
    2) find probability wall height is less than 199cm & greater than 201cm?

    -------------
    how do you incorporate the 10 rows instead of just one?
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  2. #2
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    Quote Originally Posted by john1985 View Post
    Question
    height of one row = mean = 20.00cm
    std dev = 0.25cm

    if a wall has 10 rows (i.e. 10* 20cm = 200cm)
    1) what is the distribution of the height?
    2) find probability wall height is less than 199cm & greater than 201cm?

    -------------
    how do you incorporate the 10 rows instead of just one?
    Use the Theorem found here: Sum of normally distributed random variables - Wikipedia, the free encyclopedia
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