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Math Help - Standard Deviation

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    Standard Deviation

    A study of the weights of the brains of Swedish men found that the weight X was a random variable with mean 1400 grams and standard deviation 20 grams. Find positive numbers a and b such that Y = a + bX has mean 0 and a standard deviation 1.
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    Quote Originally Posted by DINOCALC09 View Post
    A study of the weights of the brains of Swedish men found that the weight X was a random variable with mean 1400 grams and standard deviation 20 grams. Find positive numbers a and b such that Y = a + bX has mean 0 and a standard deviation 1.
    Use the following formulae:

    E(Y) = a + b E(X)

    Var(Y) = b^2 Var(X)
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