statistics
posted by lee .
Consider a binomial experiment with 20 trials and probability 0.45 on a single trial. Use the normal distribution to find the probability of exactly 10 successes. Round your answer to the thousandths place.

Try the binomial probability function:
P(x) = (nCx)(p^x)[q^(nx)]
x = 10
n = 20
p = 0.45
q = 1  p = 1  0.45 = 0.55
Substitute the values and calculate.
An easier way would be to use a binomial probability table with the values stated above.
I hope this will help.