Forty percent of students at small colleges have brought their own personal computers to campus. A random

Question:

Forty percent of students at small colleges have brought their own personal computers to campus. A random sample of 120 entering freshmen was taken.
a. What is the standard error of the sample proportion bringing their own personal computers to campus?
b. What is the probability that the sample proportion is less than 0.33?
c. What is the probability that the sample proportion is between 0.38 and 0.46?