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Difficulty:
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Question Stats:
37% (02:28) correct
63%
(02:35)
wrong
based on 276
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A survey is done in am office among 120 people to know how many of them like their boss. 50 people not only like their boss but also admire him. If an employee is selected at random, is the probability that he neither likes his boss nor admires him less than 20%?
1. 10 employees do not like their boss
2. 80% of the employees admire their boss
1. 10 employees do not like their boss
2. 80% of the employees admire their boss
31 Jul 2018, 01:14
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ankit2601
A survey is done in am office among 120 people to know how many of them like their boss. 50 people not only like their boss but also admire him. If an employee is selected at random, is the probability that he neither likes his boss nor admires him less than 20%?
1. 10 employees do not like their boss
2. 80% of the employees admire their boss
1. 10 employees do not like their boss
2. 80% of the employees admire their boss
SO 4 groups -
1) Only Like boss - L
2) Only admire boss - A
3) both - B
4) neither - N
L+A+B+N=120
B=50
IS N< 20% 0r 20*120/100 that is ' Is N < 24?"
1. 10 employees do not like their boss
so A+N=10 therefore \(\leq{10}\)
ans YES
suff
2. 80% of the employees admire their boss
so remaining 20 5 can be all who do not like also, that is L is sub set of A, then N=20%....NO
if even any one of remaining likes then N<20%.. YES
insuff
A
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General Discussion
09 Aug 2018, 08:53
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chetan2u
ankit2601
A survey is done in am office among 120 people to know how many of them like their boss. 50 people not only like their boss but also admire him. If an employee is selected at random, is the probability that he neither likes his boss nor admires him less than 20%?
1. 10 employees do not like their boss
2. 80% of the employees admire their boss
1. 10 employees do not like their boss
2. 80% of the employees admire their boss
SO 4 groups -
1) Only Like boss - L
2) Only admire boss - A
3) both - B
4) neither - N
L+A+B+N=120
B=50
IS N< 20% 0r 20*120/100 that is ' Is N < 24?"
1. 10 employees do not like their boss
so B+N=10 therefore \(\leq{10}\)
ans NO
suff
2. 80% of the employees admire their boss
so remaining 20 5 can be all who do not like also, that is L is sub set of A, then N=20%....YES
if even any one of remaining likes then N<20%
insuff
A
i couldn't understand how it could be B+N =10, IMO it should be A+N =10
