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Author Question: What is the probability that the stock has a return of at least 8? What will be an ideal ... (Read 80 times)

elizabeth18

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on: Jun 24, 2018
What is the probability that the stock has a return of at least 8?
 
  What will be an ideal response?

Question 2

Suppose that 24 of all sales in a grocery store are for amounts greater than 100.
 
  In a random sample of 50 invoices, what is the probability that more than ten of the invoices are for over 100? Use the normal approximation for the binomial distribution.


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BAOCHAU2803

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Reply #1 on: Jun 24, 2018
Answer to Question 1

1 - (0.09 + 0.14 + 0.16 ) = 0.61

Answer to Question 2

P = 0.24, n = 50,  =E(X) = nP = 12, 2 = Var(X) = nP(1 - P) = 9.12,  = 3.02
Without continuity correction P(X > 10 ) = P(Z > -0.66 ) = 0.7454.


elizabeth18

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Reply 2 on: Jun 24, 2018
YES! Correct, THANKS for helping me on my review

dantucker

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Reply 3 on: Yesterday
Excellent

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