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In a certain animal population, for each of the first 3

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Director
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In a certain animal population, for each of the first 3 [#permalink] New post 21 Jan 2005, 07:36
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A
B
C
D
E

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In a certain animal population, for each of the first 3 months of life, the probability that an animal will die during that month is 1/10. For a group of 200 newborn members of the population, approximately how many would be expected to survive the first 3 months of life?
(A) 140
(B) 146
(C) 152
(D) 162
(E) 170

Last edited by qhoc0010 on 21 Jan 2005, 12:18, edited 1 time in total.
Director
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 [#permalink] New post 21 Jan 2005, 07:54
I guess there is a flaw in your proba...
Manager
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 [#permalink] New post 21 Jan 2005, 08:37
I agree with twixt, how can the probability be 101. The total probability of any event is 1.
SVP
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 [#permalink] New post 21 Jan 2005, 11:54
I've seen that question. The probability in the question is 10%.
Director
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 [#permalink] New post 21 Jan 2005, 21:41
Expected value = Prob of survival for 3 months * Number of samples
E(x) = (9/10)*(9/10)*(9/10)*200 = 146
Director
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 [#permalink] New post 22 Jan 2005, 04:59
Got it, thx
OA is (B)
  [#permalink] 22 Jan 2005, 04:59
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In a certain animal population, for each of the first 3

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