Question

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.​

Answer 1

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

good day

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Answer 2

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