Question

The mean and S.D. of a binomial distribution are 25 And 5 respectively then number of trial n is​

Answer 1

SOLUTION

GIVEN

The mean and S.D. of a binomial distribution are 25 And 5 respectively

TO DETERMINE

The number of trial n

EVALUATION

Let the parameter in the binomial distribution are n and p

Then q = 1 - p

Mean = np

$\sf{S. D = \sqrt{npq} }$

So by the given condition

np = 25 - - - - (1)

$\sf{\sqrt{npq} = 5 }$

$\sf{npq=2 5 \: \: \: - - - - (2)}$

From Equation 1 and Equation 2 we get

q = 1

Which is impossible

So the required number of trial can not determined

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Answer 2

Answer:

Step-by-step explanation:

1