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lelliott86
10.07.2019 •
Mathematics
If you buy a school raffle ticket for $1, your overall probability of winning at least one of the prizes is 0.03. you can improve your odds of winning something by buying two tickets. what is the probability that one or the other of your tickets will win something? (round your answer to the nearest ten-thousandth) a. 0.0591 b. 0.0018 c. 0.6200 d. 0.0396 e. 0.0726
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Ответ:
either a) :
p (a ticket does not win a prize) = 1 - 0.02 = 0.98 ;
so p (neither of two tickets wins a prize = 0.9^2 = 0.9604 .
hence probability if winning a prize with two tickets is
1 - 0.9604 = 0.0396 -option e
or b) :
wi : ticket i wins a prize
tree diagram:
w1 p = 0.02 w2 p = 0.02 \
. . . . . . . . w2' p = 0.98 / p = 0.02
. . . w1' p = 0.98 w2 p = 0.02 p = 0.0196
. . . . . . . . w2' p = 0.98 no prize
p (a prize) = (sum of first three rows -- first two need not be split! )
= 0.0396 , as before
so the answer is d
hope that !
Ответ:
yes i do
Step-by-step explanation: