Assume a binomial probability distribution with n=55 and p=0.25. Compute the following: (Round all z values to 2 decimal places.)

a. The mean and standard deviation of the random variable. (Round your "" to 4 decimal places and mean to 1 decimal place.)

b. The probability that X is22 or more. (Use the rounded values found above. Round your answer to 4 decimal places.)

c. The probability that X is 14 or less. (Use the rounded values found above. Round your answer to 4 decimal places.)