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# At a certain hospital, 75% of the interns receive fewer than

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Senior Manager
Joined: 24 Feb 2008
Posts: 349

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Schools: UCSD (\$) , UCLA, USC (\$), Stanford
At a certain hospital, 75% of the interns receive fewer than [#permalink]

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22 Mar 2008, 18:18
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At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?
A. 6
B. 14
C. 19
D. 20
E. 81
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Kudos [?]: 3503 [0], given: 2

Senior Manager
Joined: 15 Aug 2007
Posts: 252

Kudos [?]: 71 [0], given: 0

Schools: Chicago Booth

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22 Mar 2008, 18:27
C-19

Interns who get lessthan 6 hours sleep:
80% of all interns
% who complain tired - 75% of total interns
% who don't complain - 5% of total interns

Interns who get 6 or more hours sleep:
20% of all interns
70% of 20% which 14% of total interns report not tired.

so total % of interns who report not tired - 5+14=19%

Kudos [?]: 71 [0], given: 0

Re: PS: interns   [#permalink] 22 Mar 2008, 18:27
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