Fifty-one percent of workers are confident that they will retire witha comfortable lifestyle. You randomly select 10 workers, ask them if they are confident with their life after retirement, and let X be the number of positive answers.
(a) What is the variance of this binomial distribution?
[a]
(b) P(X>2)= [b] (round to 4 decimal places)
(c) P(X>=2)= [c] (round to 4 decimal places)
(d) P(2<=X<=5)= [d] (round to 4 decimal places)

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