Questions
The mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20,50, respectively. The correct mean is
a
48
b
82.5
c
50
d
80
detailed solution
Correct option is C
Sum of 100 items = 49 x 100 = 4900 Sum of items added = 60 + 70 + 80 = 210 New sum = 4900 + 210 - 110 = 5000 Correct mean =5000100=50Talk to our academic expert!
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| Frequency f of x | 4 | 5 | y | 1 | 2 |
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