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25 October, 15:13

According to an on-line dating website, 20% of the couples who are in committed relationships met on-line. Suppose you know 15 couples in a committed relationship. What is the expected number of couples who met on-line? What is the standard deviation?

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  1. 25 October, 16:19
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    15/x = 20/100

    15*100 = 20*x

    1500 = 20x

    1500/20 = 20x/20

    75 = x

    15/75 = 20/100

    the expected number of couples who met online is 75
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