Statistics

In a study by Peter D. Hart Research Associates for the Nasdaq Stock Market, it was determined that 20% of all stock investors are retired people. In addition, 40% of all adults invest in mutual funds. Suppose a random sample of 25 stock investors is taken.

a. What is the probability that exactly seven are retired people?
b. What is the probability that 10 or more are retired people?
c. How many retired people would you expect to find in a random sample of 25 stock investors?
d. Suppose a random sample of 20 adults is taken. What is the probability that exactly seven adults invested in mutual funds?
e. Suppose a random sample of 20 adults is taken. What is the probability that fewer than six adults invested in mutual funds?
f. Suppose a random sample of 20 adults is taken. What is the probability that none of the adults invested in mutual funds?
g. Suppose a random sample of 20 adults is taken. What is the probability that 12 or more adults invested in mutual funds?
h. For parts e�g, what exact number of adults would produce the highest probability? How does this compare to the expected number

  1. 0
  2. 41
asked by Brahmprakash
  1. asdfasdfasdf

    1. 0
    posted by will
  2. Let X be the random variable denoting the number of retired people
    a) P(X=7) = 25C7∗0.27∗0.818 = 0.1108
    b) P(X>=10) =1-P(X<=9) Using the Binomdist() excel Function , which calculates P(X<=x) =1-.98266 = 0.0173
    c)In a random sample of 25, the expected number is : 25*0.2 =5 Let Y be the random variable denoting number ofU.S. adults investing in mutual funds. Y~Bin(20,0.4)

    1. 0
    posted by help
  3. good

    1. 0
    posted by rit

Respond to this Question

First Name

Your Response

Similar Questions

  1. Scl. Stds, economics

    I need help! the answers are not in our book. Who were the curbstone brokers and what type of stocks were handled on the curb? When was the wall street journal first published and what promise did it make to its readers? What is
  2. business math

    #3 of case study: If Naomi invests in a stock portfolio, her returns for 10 or more years will average 10%-12%. Naomi realizes that the stock market has higher returns because it is a more risky investment than a savings account
  3. bUSINESS

    I NEED HELP TO FIND PENNY STOCKS AT NASDAQ. Penny stocks usually sell for less than $1.00 a share -- although some investors consider any stock selling for less than $5.00 a share a penny stock. Please check with your instructor
  4. 3rd grade math

    peter's mother picked him up at jill's house after they ate. then she drove to the market to buy food. the market is 1/3 of the way to peter's house from jill's. if the entire distance is 12 miles, how far is peter's house from
  5. Statistics

    The returns on the NASDAQ Index and the following stocks on the NASDAQ Exchange were calculated for the period January 2001 to December 2006 are shown in Xm04-73. Amgen Ballard Power Systems Cisco Systems Intel Microsoft Calculate
  6. business math

    If Naomi invests in a stock portfolio, her returns for 10 or more years will average 10%-12%. Naomi realizes that the stock market has higher returns because it is a more risky investment than a savings account or a CD. She wants
  7. business math

    If Naomi invests in a stock portfolio, her returns for 10 or more years will average 10%-12%. Naomi realizes that the stock market has higher returns because it is a more risky investment than a savings account or a CD. She wants
  8. Research

    I would like to have your input on the following questions. (1) Why is students study habits worth a study for a research proposal? (2) For the following research topic, describe a quantitative and a qualitatitive study focused on
  9. Macroeconomics - real GDP growth

    I have graphed the real GDP growth over the years 1990-2004. I need help analyzing it! What happened when it was going down? What happened when it shot back up again? HELP! Thanks... The GDP growth rate went down considerably
  10. finance (Check Answer plz)

    Following are rates of return on medical equip. company's stock and debt, and on the market portfolio, along with the probability of each state. State Prob. Ret.on Stock Ret.on Debt Ret.on Market 1 .1 3 8 5 2 .3 8 8 10 3 .4 20 10

More Similar Questions