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The mean of a set of 30 observations is...

The mean of a set of 30 observations is 75. If each observation is multiplied by non zero number `lambda` and then each of them is decreased by 25.Their mean remains the same then `lambda` is equal to

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The mean of a set of 30 observations is 75 . if each observations is multiplied by a non zero number lamda and then each of them is decreased by 25 . Their mean remains the same. Then lambda is equal to

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