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WAEC Further Mathematics 2020 Paper

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Question : 30

Total: 39

Calculate the variance of

\sqrt{2}

\sqrt{2}

\sqrt{2}

)

0
$\sqrt{ \; \frac{2}{3} }$
$\; \frac{2}{3}$
2

Solution:

x

(x -

\overline{x}

)

(x -

\overline{x}

)

$\sqrt{2}$

1 + $\sqrt{2}$

2 + $\sqrt{2}$

-1

0

1

1

0

1

$\overline{2}$

variance = $\; \frac{\sum (x - \overline{x})^2}{n}$

= $\; \frac{2}{3}$

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