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Find the mean, variance and standard dev...

Find the mean, variance and standard deviation using short-cut method.

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Find the mean and standard deviation using short-cut method.

Find the mean and standard deviation using short-cut method

Find the mean and standard deviation using short-cut method.

Find the mean and standard deviation using short - cut method.

Find the mean and standard deviation using short cut method

Find the mean and standard deviation using short cut method

Find the mean and standard deviation using short-cut method: