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If the probability that Stock X will increase in value during the next

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If the probability that Stock X will increase in value during the next  [#permalink]

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New post 02 Oct 2018, 01:23
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Question Stats:

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If the probability that Stock X will increase in value during the next week is 0.40 and the probability that Stock Y will increase in value during the next week is 0.60, what is the probability that exactly one of Stock X and Stock Y would increase in value during the next week? It is known that price fluctuations of Stock X in no way affect the price fluctuations of Stock Y.

(A) 0.48
(B) 0.50
(C) 0.52
(D) 0.56
(E) 0.58

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Re: If the probability that Stock X will increase in value during the next  [#permalink]

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New post 02 Oct 2018, 01:34
Bunuel wrote:
If the probability that Stock X will increase in value during the next week is 0.40 and the probability that Stock Y will increase in value during the next week is 0.60, what is the probability that exactly one of Stock X and Stock Y would increase in value during the next week? It is known that price fluctuations of Stock X in no way affect the price fluctuations of Stock Y.

(A) 0.48
(B) 0.50
(C) 0.52
(D) 0.56
(E) 0.58


p( stock X will increase) = 0.4 = p(x)
p( stock Y will increase) = 0.6 = p(y)

p(exactly one will increase) = p(x)*1-p(y) + p(y)*1-p(x) = .4*.4 + .6*.6 = .16+.36 = 0.52
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Re: If the probability that Stock X will increase in value during the next &nbs [#permalink] 02 Oct 2018, 01:34
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