mean of 46 items is 30. it was discovered that three items which should have been 33, 38, 39 were wrongly read as 25, 30, 35 respectively. the correct mean is
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get mean of 46 items is 30. it was discovered that three items which should have been 33, 38, 39 were wrongly read as 25, 30, 35 respectively. the correct mean is from screen.
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
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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
A48
B49
C50
D80
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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 ______.
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 ______.
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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 ______.
OPTIONS
48 49 50 60 Advertisement Remove all ads
SOLUTION
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 = 5000100=50
Concept: Mean of Grouped Data
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The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31. Find the correct mean.
The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31. Find the correct mean.
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The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31. Find the correct mean.
A) 36.12 B) 30.66 C) 29.28 D) 38.21 Correct Answer: C) 29.28
Description for Correct answer:
According to the question
The mean of 50 no. is = 30
Sum of 50 no. is = 50×30=1500 50×30=1500
later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31.
∴ ∴
Difference = (82 + 13) - (28 + 31) = 95 - 59 = 36 (Extra)
∴ ∴
Actual sum of 50 numbers is 1500 - 36 = 1464
∴ ∴ Actual avg. 1464 50 =29.28 146450=29.28
Part of solved Average questions and answers : >> Aptitude >> Average
Comments Similar Questions
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