Ans: B
I is not true. The upper quartile of the distribution is $70$ marks.
I is not true. The upper quartile of the distribution is $70$ marks.
II is true. The mean and the standard deviation are $63.25$ marks and $11.575\ 296\ 97$ marks. Hence, the standard score of Ada
$\begin{array}{cl}
= & \dfrac{85 – 63.25}{11.575\ 296\ 97} \\
= & 1.879\ 001\ 468 \\
< & 2
\end{array}$
III is not true. The standard deviation is $11.575\ 296\ 97$ marks, which is smaller than $12$ marks.
