I don't understand 2 or 3

Painter et al. [31] reported that during the first month of the U.S. COVID-19 vaccination program, approximately 4% of the total population received at least 1 dose of the COVID-19 vaccine. 1. Suppose we collect a sample of 1000 people. What proportion of these individuals would you expect to see to have received the vaccine within the first month? n = 1003 1ME( x) = AP = 1000..04 = 40 2.9 40 = 4. = 1/25 2. What is the standard error of the sample proportion for the sample 1000 people? 3. Using prior knowledge from Chapter 6, do you think it'd be likely to observe 4.5% from the sample of 1000 having received the vaccine in the first month? our sample size to 5000 people. Would your answer to