Statistics

Below are the numbers of games played in the World Series from 1903 to 2012. Find the mean, variance and standard deviation.
Games played Probability
4 0.186
5 0.231
6 0.203
7 0.341
8 0.039

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  1. Find the mean first = sum of scores/number of scores

    Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

    Standard deviation = square root of variance

    I'll let you do the calculations.

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