The mean of set of 30 observations is 75. If each observation is multiplied by a non-zero number λ and then each of them is decreased by 25, their mean remains the same. Then λ is equal to:

Statistics and Probability: JEE Main 2018 Mathematics question

JEE Main 2018 · 15 Apr, Morning shift · Q5415

JEE Main 201815 Apr, Morning shiftMathematicsEasyStatistics and Probability258× since 2002

The mean of 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 :

JEE Main 2018 · 15 Apr, Morning shift · Q5415

JEE Main 201815 Apr, Morning shiftMathematicsEasyStatistics and Probability258× since 2002

The mean of 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 :