The AM of n observations is M. If the sum of (n – 4) observations is a ,then the mean of remaining four observations is

# The AM of n observations is M. If the sum of (n - 4) observations is a ,then the mean of remaining four observations is

1. A

$\frac{\mathrm{nM}-\mathrm{a}}{4}$

2. B

$\frac{\mathrm{nM}+\mathrm{a}}{2}$

3. C

$\frac{\mathrm{nM}-\mathrm{a}}{2}$

4. D

$\mathrm{nM}+\mathrm{a}$

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Let ${\mathrm{x}}_{1},{\mathrm{x}}_{2},\dots ,{\mathrm{x}}_{\mathrm{n}}$ be n observations.