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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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The assumed mean for the following is 92.5
THus, the mean of the following is
`Mean=92.5+6/60xx5=93`
`Variance = 5^2[254/60-(6/60)^2]`
`variance= 25/3600xx15204`
`Variance=105.58`
...
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