MathematicsEasy89×since 2002Q5415The mean of set of 30 observations is 75. If each observation is multiplied by a non-zero number λ\lambdaλ and then each of them is decreased by 25, their mean remains the same. Then λ\lambdaλ is equal to :A13{1 \over 3}31B23{2 \over 3}32C43{4 \over 3}34D103{10 \over 3}310Check answerSkip