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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 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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The mean of a set of 30 observations is 75. If each observation is multiplied by a 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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