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    Statistics

    If 36 students took a test. The mean of those who passed was 78. The mean of those who failed is 60. The mean of all scores is 70. How many students failed the test ?
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    Quote Originally Posted by Jhonson View Post
    If 36 students took a test. The mean of those who passed was 78. The mean of those who failed is 60. The mean of all scores is 70. How many students failed the test ?
    Solve simultaneously:

    78 x_p + 60 x_f = (36)(70) .... (1)

    x_p + x_f = 36 .... (2)
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