Question

The mean of 10 observation is 8, if one of the observation is wrongly recorded as 11 instead of 9.find the corrected mean

Answer 1

Answer:

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Answer 2

ANSWER:

correct mean = 7.8

Step-by-step explanation:

mean = sum of observation / total no. of observation

8 = x/10

x= 80

New sum = 80 - 11 + 9

= 78

New mean = 78/10

= 7.8

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