the mean of 9 observation was found to be 35 later on it was discovered that an observation 81 was misread as 18 find the correct mean of observation
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Answered by
10
Answer:
42
Step-by-step explanation:
the uncorrect mean = (f + 18 )/9 = f/9 + 2
the correct mean = (f + 81 )/9 = f/9 + 9
( f being the sum of the other 8 observations )
therefore
the correct mean = 35 +7 = 42
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