Question

The mean of a B.D, is $15$ and standard deviation is $5$, then which one of the following is correct.

• A. $p=\frac{2}{3}$
• B. $q=\frac{5}{3}$
• C. data's are absolutely correct
• D. data's are absolutely wrong

Answer 1

Answer: (D)

data's are absolutely wrong

We know that mean $\mu =np=15$ and ${\sigma }^2=npq=25$
Here variance is greater than mean which can't possible. Hence the statement is wrong.