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Assume that x is a binomial random variable with n = 20 and p = .5....

Assume that x is a binomial random variable with n = 20 and p = .5. Use the binomial probabilities table and the normal approximation to find the exact and approximate values, respectively, of the following probabilities:

a.P(x<=9)

b.P(x>=11)

c. P(8<=x<=11)

I have no idea how to use the binomial probability table and the answers are:

a. .327,.411

b. .327,.411

c..483,.498

b

math   Statistics-And-Probability   
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