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Phrases Previous Year Questions (PYQs)
Phrases Probability Distribution PYQ
The mean and variance of a random variable X having binomial distribution are 4 and 2 respectively. The P(X = 1) is
Go to Discussion
Solution
np = 4
npq = 2
q = 1/2, p = 1/2, n = 8
p(X = 1) = 8C1 (1/2)(1/2)7
If 
is the mean of distribution of x, then usual notation 
is
is the mean of distribution of x, then usual notation isGo to Discussion
Solution
Mean Deviation from mean is Zero.Phrases
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