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16 Apr 2005, 20:53
Kudos
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Hey Guys,
Know the Q's below are probability based .. But no clue how to go about solving them. If anyone could explain, that would be great! Thanks.
A nationwide survey showed that 65% of all children in the United States dislike eating vegetables. If 4 children are chosen at random, what is the probability that all 4 dislike eating vegetables? (Round your answer to the nearest percent)
a. 18%
b. 260%
c. 2%
d. none of the above
In New York state, 48% of all teenagers own a skateboard and 39% of all teenagers own a skateboard and roller blades. What is the probablity that a teenager owns roller blades given that the teenager owns a skateboard?
a. 87%
b. 81%
c. 123%
d. none of the above
Know the Q's below are probability based .. But no clue how to go about solving them. If anyone could explain, that would be great! Thanks.
A nationwide survey showed that 65% of all children in the United States dislike eating vegetables. If 4 children are chosen at random, what is the probability that all 4 dislike eating vegetables? (Round your answer to the nearest percent)
a. 18%
b. 260%
c. 2%
d. none of the above
In New York state, 48% of all teenagers own a skateboard and 39% of all teenagers own a skateboard and roller blades. What is the probablity that a teenager owns roller blades given that the teenager owns a skateboard?
a. 87%
b. 81%
c. 123%
d. none of the above
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16 Apr 2005, 23:40
Kudos
Bookmarks
gix
(1) The probability of a kid's disliking eating vegetables = 13/20.
The probability of 4 kids out of 4 disliking vegetables = (13/20)^4
= 0.178 = 18%
(D).
(2) Out of a sample 100 teeangers, 48 own skateboards, and of them 39 own roller blades as well. Thus for a given teenager having a skateboard, the probability of having roller blades = 39/48 = 13/16 = 0.712 = 71%
(D).
Please post your solutions too.
Thanks.
