Suppose you have a problem to solve in which 71% of Internet users connect using standard telephone lines. The population proportion is .71.

Now, we want to find the probability that a sample proportion from a random sample of 350 Internet users will be at least .75.

Can someone help me determine how to solve this? I'm not asking for the answer, just the process. I'm wondering if this is a two-part problem. First, we may need to determine the standard deviation of "p" by taking the square root of "p(p-1)/n" where "n" is the sample size. Then I don't know.

Please help.