1.

The mean of a set of 30 observations is 75. If each observations is multiplied by a non-zero numberse lambda and then each observations is decreased by 25, their mean remains the same. Thenlambdais equal to

Answer»

`( 1)/(3)`
` ( 2)/(3)`
` ( 4)/(3)`
` ( 10 )/(3)`

Answer :C


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