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Math (Statistics)

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I am to find the mean, variance, and standard deviation for the probability distribution. I don't even know where to start. Here is the problem

x P(x)
0 0.19
1 0.32
2 0.28
3 0.21

  • Math (Statistics) -

    Formula for the mean:
    SUM [x * P(x)]

    Take x times P(x) for each value listed. Then add for the mean.

    Formula for the variance:
    {SUM [x^2 * P(x)] - mean^2}

    Square each x. Then take x^2 times P(x) for each value. Add up the values for a total, then subtract mean squared from that total.

    For standard deviation:
    Take the square root of the variance.

    I hope this will help.

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