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Numerical Ability
Averages
The mean of 100 abservations was calculated was 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is :
a. 39
b. 39.7
c. 40.3
d. 42.7
Read Solution (Total 3)
-
- correct sum =(40*100 +53 -83) = 3970
correct mean = 3970/100 = 39.7 - 10 years agoHelpfull: Yes(5) No(1)
- (x1+..........+83+........+x100)/100=40
=> x1+...........+83+........+x100=4000
=>x1+...............+x100=4000-83 -(1)
(x1...........+53+.........+x99+x100)/100=y
=> x1+...........+53+...........+x100=100y
=> x1+..............+x100=100y-53 -(2)
from (1)(2),we get
4000-83=y*100-53
100y=3970
y=39.70 - 7 years agoHelpfull: Yes(2) No(0)
- Answer is 39.7
- 7 years agoHelpfull: Yes(0) No(0)
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