Question

The mean of four numbers a, b, c, d is 100. if c = 70, then the mean of the remaining numbers is

Answer 1

$\textsf{Given:}$

$\textsf{Mean of a,b,c and d is 100}$

$\mathsf{Mean=\displaystyle\frac{\Sigma{x}}{n}}$

$\implies\mathsf{100=\displaystyle\frac{a+b+c+d}{4}}$

$\implies\mathsf{100{\times}4=a+b+70+d}$

$\implies\mathsf{a+b+d=330}$

$\textsf{The mean of the remaining 3 numbers=}\mathsf{\displaystyle\frac{a+b+d}{3}}$

$\textsf{The mean of the remaining 3 numbers=}\mathsf{\displaystyle\frac{330}{3}}$

$\therefore\textsf{The mean of the remaining 3 numbers=110}$

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