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प्रश्न
Mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively. The correct mean is ______.
पर्याय
48
49
50
60
MCQ
रिकाम्या जागा भरा
उत्तर
Mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively. The correct mean is 50.
Explanation:-
Sum of 100 observations
= 100 × 49 = 4900
Correct sum
= 4900 - [40 + 20 + 50 ] + [60 + 70 + 80] = 5000
∴ Correct mean = `5000/100=50`
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