Can you please help me answer this study guide question? I am new to statistics and I have no idea how to explain it. Thank you ahead of time for your time and effort.

Suppose that we wish to assess whether more than 60 percent of all US. households in a particular income class bought life insurance last year. That is, we wish to assess whether p, the proportion of all US. households in the income class that bought life insurance last year, exceeds .60. Assume that an insurance survey is based on 1,000 randomly selected US. households in the income class and that 640 of these households bought life insurance last yeaL a) Assuming that p equals .60 and the sample size is 1,000, what is the probability of observing a sample proportion that is at least .64? b) Based on your answer in part a, do you think more than 60 percent of all US. households in the income class bought life insurance last year? Explain