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From a set of 100 numbers, half were selected to form group
[#permalink]
06 Nov 2019, 08:04
06 Nov 2019, 08:04
Expert Reply
00:00
Question Stats:
81% (01:34) correct
18% (02:12) wrong based on 27 sessions
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From a set of 100 numbers, half were selected to form group I, and 60 percent of the remaining numbers were selected to form group II. The average (arithmetic mean) of the numbers in group I is 24.4, and the average of the numbers in group II is 31.5. Which of the following is closest to the average of the numbers in groups I and II combined?
A. 27.1
B. 27.6
C. 27.8
D. 28.0
E. 28.3
Kudos for the right solution and explanation
A. 27.1
B. 27.6
C. 27.8
D. 28.0
E. 28.3
Kudos for the right solution and explanation
Re: From a set of 100 numbers, half were selected to form group
[#permalink]
20 Apr 2020, 15:59
20 Apr 2020, 15:59
Expert Reply
group 1 = 50
avg = 24.4 ; sum = 1220
group II = 30
avg= 31.5 ; sum = 945
total sum = 1220+945 ; 2165
avg = 2165/80 = ~27.1
IMO A
avg = 24.4 ; sum = 1220
group II = 30
avg= 31.5 ; sum = 945
total sum = 1220+945 ; 2165
avg = 2165/80 = ~27.1
IMO A
gmatclubot
Re: From a set of 100 numbers, half were selected to form group [#permalink]
20 Apr 2020, 15:59
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