Question

help me if x is the random variable such that E(x)=2.4,P=0.6,find the value of n and standard deviation

Answer 1

is \(X\) binomial?

Answer 2

yes

Answer 3

binomial

Answer 4

\[E[X]=np\]

so \[np=2.4\]

and \[n=\frac{2.4}{p}\]

plug in your value of \(p\)

Answer 5

\[Var[X]=npq\]

so \[Sd[X]=\sqrt{npq}\]

where \(q=1-p\)

Answer 6

thankx much in deed

Answer 7

no problem