If x is a binomial random variable, compute the mean, the standard deviation, and the variance for each of the following cases:
1 answer:
Answer:
(a)
,
, 
(b)
,
, 
(c)
,
, 
(d)
,
, 
Step-by-step explanation:
A binomial random variable counts how often a particular event occurs in a fixed number of tries or trials.
For a binomial random variable
, we can use these formulas for mean, standard deviation, and variance:



Applying the above formulas we get,
(a) n = 3, p = 0.4



(b) n = 5, p = 0.8



(c) n = 5, p = 0.3



(d) n = 4, p = 0.8



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