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NORMAL DISTRIBUTION — Statistics STD 12 Commerce — Question

Gujarat BoardEnglish MediumSTD 12 CommerceStatisticsNORMAL DISTRIBUTION3 Marks
Question
A normal variable $x$ has the following probability density function: $f(x)=\frac{1}{\sqrt{450 \pi}} e^{-\frac{(x-72)^{2}}{450}}$What percentage of observations of this distribution will be between $60$ and $81 ?$
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Answer

$51.38 \%$

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