SOLUTION: Hi Tutor, I need help for this question. I tried, but not sure the answer. "A manufacturer makes three models of television set, models A, B and C. A store sells 40% of mod

Question 225306: Hi Tutor,
I need help for this question. I tried, but not sure the answer.
"A manufacturer makes three models of television set, models A, B and C. A store sells 40% of model A, 40% of model B and 20% of model C. Of model A sets, 3% have stereo sound, of model B sets, 7% have stereo sound and of model C sets, 9% have stereo sound. If a set is sold at random, find the probability that it has stereo sound"
My Answer is :- 19/100 (is it correct?)
Thanks Tutor! :)
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
your number is too high

if the store sold 500 tv's; 200 would be A's, 200 would be B's, and 100 would be C's

there would be 6 A-stereos, 14 B-stereos, and 9 C-stereos

the probability of a stereo set being sold is 29/500
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