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B
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Difficulty:
45%
(medium)
Question Stats:
60% (01:13) correct
40%
(01:17)
wrong
based on 276
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Mr. Kip has been selected in the chorus group. What is the percent of chances that Mrs. Lisa is also selected in the chorus group?
(1) Mrs. Lisa and Mr. Kip together stand 5 out of 8 chances of being selected in the chorus group.
(2) If Mr. Kip is selected in the chorus group, then Mrs. Lisa is also selected in the chorus group.
(1) Mrs. Lisa and Mr. Kip together stand 5 out of 8 chances of being selected in the chorus group.
(2) If Mr. Kip is selected in the chorus group, then Mrs. Lisa is also selected in the chorus group.
14 Jan 2022, 09:15
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Bunuel
Statement 1 Alone:
This is insufficient as we don't know what the probability of Mrs. Lisa being selective is GIVEN Mr. Kip has been selected.
Statement 2 Alone:
This tells us Mrs. Lisa has a 100% chance of being selected. Sufficient.
Answer: B
30 Oct 2024, 06:58
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i love to solve these kind of questions with a table approach to be sure:
the point is that we have "GIVEN that MrKip has been selected", what is the probability that also Lisa is chosen
so we have to ISOLATE the first row (in yellow)
statement 1
this is telling us that BOTH together have a change of 5/8 to be selected, this just means that the proability for both to be selected is
(5/8 * total)/x
clearly insufficient.
statement 2
this statement is telling us that the probability that Kip is selected and Lista is not selected is zero (if Kip --> than Lisa).
meanin that the probability of both being selected is equal to the probability of Kip being selected
x/x = 1 = 100%.
sufficient
| Kip | not Kip | ||
| Lisa | -- | ||
| not Lisa | -- | ||
| -- | total |
the point is that we have "GIVEN that MrKip has been selected", what is the probability that also Lisa is chosen
so we have to ISOLATE the first row (in yellow)
statement 1
| Kip | not Kip | ||
| Lisa | 5/8 * total | ||
| not Lisa | |||
| x | total |
(5/8 * total)/x
clearly insufficient.
statement 2
| Kip | not Kip | ||
| Lisa | x | ||
| not Lisa | 0 | ||
| x | total |
meanin that the probability of both being selected is equal to the probability of Kip being selected
x/x = 1 = 100%.
sufficient
