Question

In a B.D., Mean = 2.4 and variance = 1.44, then n =

• A. 4
• B. 6
• C. 10
• D. 5

Answer 1

Answer: (B)

6

Answer 2

np = 2.4 npq = 1.44

⇒ P = 0.4, n= 6 q = $\frac{1.44}{2.4} = \frac{12}{2} = 0.6$