According to the Investment Company Institute, 40 of U S households have an Individual Retirement Account (IRA) Assuming the population proportion to be 0 40 and that a simple random sample of 400 households has been selected a What is the expected value of p the proportion in the sample having an ...

According to the Investment Company Institute, 40% of U.S. households have an Individual Retirement Account (IRA). Assuming

Question:

According to the Investment Company Institute, 40% of U.S. households have an Individual Retirement Account (IRA). Assuming the population proportion to be π = 0.40 and that a simple random sample of 400 households has been selected:
a. What is the expected value of p = the proportion in the sample having an IRA?
b. What is the standard error of the sampling of the proportion?
c. What is the probability that at least 35% of those in the sample will have an IRA?
d. What is the probability that between 38% and 45% of those in the sample will have an IRA? Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...