jee-main 2018 Q74

jee-main · India · 15apr_shift1 Measures of Location and Spread

The mean of a set of 30 observations is 75 . If each other observation is multiplied by a nonzero number $\lambda$ and then each of them is decreased by 25 , their mean remains the same. The $\lambda$ is equal to
(1) $\frac { 10 } { 3 }$
(2) $\frac { 4 } { 3 }$
(3) $\frac { 1 } { 3 }$
(4) $\frac { 2 } { 3 }$

The mean of a set of 30 observations is 75 . If each other observation is multiplied by a nonzero number $\lambda$ and then each of them is decreased by 25 , their mean remains the same. The $\lambda$ is equal to\\
(1) $\frac { 10 } { 3 }$\\
(2) $\frac { 4 } { 3 }$\\
(3) $\frac { 1 } { 3 }$\\
(4) $\frac { 2 } { 3 }$

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