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The mean of 20 observations is 17. On checking it was found that the two observation were wrongly copied as 3 and 6. If wrong observation are replaced by correct values 8 and 9, then what is the correct mean?
17.4
16.6
15.8
14.2
As mean of 20 observation = 17 Then, sum of 20 observations = 17×20 = 340 According to question, (340−3−6+8+9)/20= 348/20=17.4
By: Munesh Kumari ProfileResourcesReport error
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