Question

In considering the purchase of a certain stock (Y), suppose you attach the following probabilities to possible changes in the

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Answer #1

Solution:

given

probabilities to possible changes in the stock price over the next year.

(a)  expected change in stock price, or E(Y):

E(Y) = 15* 0.1 + 5* 0.35 + 0* 0.35 - 5 * 0.15 - 15* 0.05

= 1.5 + 1.75 + 0 - 0.75 - 0.75

= 1.5 + 1.75 - 1.5

E(Y)   = 1.75 ( % )

(b) probability that the stock price falls is:

from given values

at 0.05 the probability stock price falls to the least -15

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