The outcome of each of 30 items was observed; 10 items gave an outcome … – d each, 10 items gave outcome … each and the remaining 10 items gave outcome …+ d each. If the variance of this outcome data is … then |d| equals :

Option C. Variance is independent of region. So we shift the given data by ….

Statistics

JEE Main 2019 · 11 Jan, Morning shift · Q5446

MathematicsMedium89×since 2002Q5446

The outcome of each of 30 items was observed; 10 items gave an outcome

{1 \over 2}

– d each, 10 items gave outcome

{1 \over 2}

each and the remaining 10 items gave outcome

{1 \over 2}

+ d each. If the variance of this outcome data is

{4 \over 3}

then |d| equals :