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02 Jun 2021, 02:45
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
70% (01:13) correct
30%
(01:23)
wrong
based on 217
sessions
History
Date
Time
Result
Not Attempted Yet
Jake remembers only the last three letters of his four-letter Klingon name. If he is sure that the first letter is neither "N" nor "Z", and assuming that there are only 10 letters in the Klingon alphabet, what is the probability that he will give the correct name when asked for it by the space attendant?
A. 8/100
B. 9/100
C. 1/8
D. 4/5
E. 9/10
A. 8/100
B. 9/100
C. 1/8
D. 4/5
E. 9/10
02 Jun 2021, 06:30
Kudos
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Bunuel
Since Jake already knows the last 3 letters of his Klingon name, we just need to find the probability of him correctly guessing the 1st letter.
There are 10 letters in the Klingon alphabet from which to choose, however Jake knows that the first letter is neither "N" nor "Z".
So, Jake must randomly select 1 of the 8 remaining letters.
This means: P(Jake correctly guesses the first letter of his name) = 1/8
Answer: C
10 Jun 2021, 06:11
Kudos
Bookmarks
i am not convinced with the solution . why cant the answer be option D?
P( choosing the correct first letter ) = 8/10
Out of 10 letters , N and Z are excluded. Hence 8 letters out of 10 available are available .
P( choosing the correct first letter ) = 8/10
Out of 10 letters , N and Z are excluded. Hence 8 letters out of 10 available are available .
