Variance of ^{10}C_0 , ^{10}C_1 , ^{10}C_2 ,. | vedclass

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Question

Variance $=\frac{\Sigma \mathrm{x}_{\mathrm{i}}^{2}}{\mathrm{n}}-\left(\frac{\Sigma \mathrm{x}_{\mathrm{i}}}{\mathrm{n}}\right)^{2}$

$=\frac{^{20}

Vedclass · Accepted Answer

$\frac{{11.\,{}^{20}{C_{_{10}}} - {2^{20}}}}{{121}}$

Vedclass · Answer

Variance $=\frac{\Sigma \mathrm{x}_{\mathrm{i}}^{2}}{\mathrm{n}}-\left(\frac{\Sigma \mathrm{x}_{\mathrm{i}}}{\mathrm{n}}\right)^{2}$

$=\frac{^{20} \mathrm{C}_{10}}{11}-\left(\frac{2^{10}}{11}\right)^{2}$

$=\frac{11 \cdot^{20} \mathrm{C}_{10}-2^{20}}{121}$

Class	$10-20$	$20-30$	$30-40$
Frequency	$2$	$x$	$2$

Variance of $^{10}C_0$ , $^{10}C_1$ , $^{10}C_2$ ,.... $^{10}C_{10}$ is

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