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Probability — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsProbability2 Marks
Question
The mean of a binomial distribution is $10$ and its standard deviation is $2$; write the value of q.
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Answer

Mean of the binomial distribution, i.e. $\text{np}=10$
$Variance = (Standard\ deviation)^2$, i.e. $\text{npq}=4$
$\therefore\text{q}=\frac{\text{Variance}}{\text{Mean}}=0.4$

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