Question

द मीन ऑफ लाइन ऑब्जर्वेशन वास फाउंड टू बी थर्टी फाइव लेटर ऑन इट वास रिजेक्टेड बाय थे ऑब्जर्वेशन विद्यालय के 1 वर्ष बिसरे 18 फाइंड द करेक्ट मीन ऑफ द नेशन​

Answer 1

Given : Mean of 9 observation was found to be 35

Later on it was found that  81 was mis read as 18

To Find : Correct mean

Solution:

Short cut method :

81 was mis read as 18

Hence correction will be  81 -  18  =  63

Observation were 9

hence mean correction = 63/9 = 7

Earlier mean = 35

Correct  Mean = 35 + 7 = 42

Detailed method :

Mean of 9 observation was found to be 35

Hence sum = 9 * 35  =  315

81 was mis read as 18

Hence correct total = 315 - 18 + 81  =  378

Correct mean = 378/9  = 42

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