Solve the following: The following random variables show the number of successful trials in joining competitions

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Solve the following: The following random variables show the number of successful trials in joining
competitions. Find the mean and standard deviation. You may use the back page for your solution.

X                                    P (X = X)
O                                   0.2

1                                   0.35

2                                   0.15

3                                   0.3

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