Question

a random variable x follows a binomial distribution with mean= 2 and variance = 1.2 Then the value of n is​

Answer 1

mean = 2

variance = 1.2

Therefore, npq = 1.2

2q = 1.2

q = 1.2/2

q = 0.6

Now, p + q = 1

p = 1 - q

p = 1 - 0.6

p = 0.4

Lastly, Mean = np

2 = n(0.4)

2/0.4 = n

5 = n