First slide

Introduction to statistics

Question

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

Easy

A

48
B

82.5
C

50
D

80

Solution

Sum of 100 items = 49 x 100 = 4900
Sum of items added = 60 + 70 + 80 = 210
New sum = 4900 + 210 - 110 = 5000
$Correct mean = \frac{5000}{100} = 50$

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