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TN XII Math
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Probability Distribution
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The mean of a binomial distribution is $6$ and its standard deviation is $3$. Is this statement true or false?comment?
tnstate
class12
bookproblem
ch10
sec-1
exercise10-3
p215
q1
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asked
Apr 20, 2013
by
poojasapani_1
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Toolbox:
A random variable $X$ is said to follow a binomial distribution of its probability mass function is given by
$P(X=x)=p(x)=\left\{\begin{array}{1 1}nC_xP^xq^{n-x},&x=0,1.......n\\0,&otherwise\end{array}\right.$
Constants of Binomial Distribution :
Mean = np
Variance = npq
Standard deviation =$\sqrt{ variance }=\sqrt{ npq}$
In a bionomial distribution Mean > Variance.
The parameters of the distribution are $n,p\quad X\sim B(n,p)$
Step 1:
It is stated that the mean=6 and the standard deviation =3
$\therefore np=6$
$\sqrt{npq}=3$
$npq=9$
Step 2:
From the above $\large\frac{npq}{np}=\frac{9}{6}=\frac{3}{2}$
$\Rightarrow q=\large\frac{3}{2}$ which is not possible
Since $0 < q < 1$
$\therefore$ the statement is false.
answered
Sep 18, 2013
by
sreemathi.v
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