GRE
Exam
Numerical Ability
Probability
Lin and Mark each attempt independently to decode a message. If the
probability that Lin will decode the message is 0.80 and the probability
that Mark will decode the message is 0.70 find the probability that
(a) both will decode the message
(b) at least one of them will decode the message
(c) neither of them will decode the message
Read Solution (Total 1)
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- (a) 0.80*0.70 = 0.56
(b) 0.80*0.30 + 0.20*0.70 + 0.80*0.70 = 0.94
(c) 0.20*0.30 = 0.06 - 14 years agoHelpfull: Yes(5) No(2)
GRE Other Question
In a box of 10 electrical parts, 2 are defective.
(a) If one part is chosen randomly from the box, what is the probability that
it is not defective?
(b) If two parts are randomly chosen from the box, without replacement,
what is the probability that both are defective?
Jim's annual salary in 1990 was $40,000 and Jose's annual salary was $49,000. If in every year thereafter, Jim received a raise of $3,300 and Jose received a raise of $2,400, which of the following was the first year in which Jim earned more than Jose?