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Expert replies
by [email protected] » Thu Jan 22, 2009 8:01 pm
16. During a 6-day local trade show, the least number of people registered in a single day was 80. Was the average (arithmetic mean) number of people registered per day for the 6 days greater than 90?
(1) For the 4 days with the greatest number of people registered, the average (arithmetic mean) number registered per day was 100.
(2) For the 3 days with the smallest number of people registered, the average (arithmetic mean) number registered per day was 85.



A
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Source: — Data Sufficiency |

by Zipper » Thu Jan 22, 2009 10:55 pm
1) 4 days average 100 two days minimal possible average 80 => mean > 90 //suff
2) 3 days smallest average = 85 so the lowest possible numbers are

80 85 90 90 90 90 = 525 / 6 = 87.5 //insuff

hence, A
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