Mean of 15 observations was found to be 75. But later on it was discovered that 61 was misread as 16. Find
the correct mean.
Answers
Answered by
0
Answer:
Wont solve it but will help you
Step-by-step explanation:
mean = 75
n = 15 (no.of observations)
sum of incorrect observations = 75 * 15
sum of correct observations = 75*15 - 61 +16
now new mean is = sum of correct observations/n
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Answered by
1
Answer:
78
Step-by-step explanation:
When one observation is misread,
Sum of all observation = Mean × 15
= 15 × 75
= 1125
Wrong sum = 1125
Actual sum = Wrong sum + 61 - 16
=> Actual sum = 1125 + 45 = 1170
Actual mean = 1170 / 15
= 78
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