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30 Dec 2016, 04:48
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
77% (01:19) correct
23%
(01:27)
wrong
based on 127
sessions
History
Date
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Not Attempted Yet
If m is the average (arithmetic mean) of the first 10 positive multiples of 2 and r is the range of the first 10 multiples of 2 what is the value of r – m?
A. 7
B. 8
C. 9
D. 14
E. 16
A. 7
B. 8
C. 9
D. 14
E. 16
30 Dec 2016, 09:08
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Bunuel
The set of Number S = { 2 , 4 , 6 , 8 , 10 , 12 , 14 , 16 , 18 , 20 }
\(m = \frac{2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20}{10}\)
\(m = \frac{2 ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )}{10}\)
\(m = \frac{55}{5}\)
\(m = 11\)
Again , \(r = 20 - 2\)
Or, \(r = 18\)
So, \(r - m = 18 - 11\)
Or, \(r - m = 7\)
Hence, answer will be (A) 7
Sirakri
30 Dec 2016, 09:14
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Bunuel
r-m=(20-2)-(20+2)/2
=>r-m=18-11=7
A
