Mean of 100 items is 50. It was discovered that three items which should have been
40, 20, 50 were wrongly read as 60, 70, 80 respectively. Find the correct mean.
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Answer:
correct mean = 49
Step-by-step explanation:
mean = sum of observations ÷ no of observations
50 = sum of observations ÷ 100
sum of observations = 50 × 100
sum of observations = 5000
40, 20, 50 were wrongly read as 60, 70, 80 respectively.
correct mean = [5000-(60 + 70 + 80)+(40+20+50)] ÷100
= [5000-210+110] ÷100
= 4900 ÷100
=49
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