ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-8)

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The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average one number, namely 36, was wrongly read as 26. The correct average is a) 20 b) 16 c) 18 d) 14

ssuad a 26 10

A student finds the average of ten 2 digit numbers. While copying numbers, by mistake, he writes one number with its digits interchanged. As a result his answer is 1.8 less than the correct answer. The difference of the digits of the number, in which he made mistake is a) 2 b) 3

10 )

In an examination, the average of marks was found to be 50. For deducting marks for computational errors, the marks of 100 candidates had to be changed from 90 to 60 each and so the average of marks came down to 45. The total number of candidates, who appeared at the examination was- a) 600 b) 300 c) 200 d) 150

3000

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

72

Mean of 10 numbers is 30. Later on it was observed that numbers 15, 23 are wrongly taken as 51 and 32. The correct mean is a) 25.5 b) 32 c) 30 d) 34.5

A tabulator while calculating the average marks of 100 students of an examination, by mistake enters 68 instead of 86 and obtained the average as 58. The actual average of those students is a) 58.18 b) 57.82 c) 58.81 d) 57.28

= 31-17 = D Activate Windows

The average marks of 14 students was 71. It was later found that the marks of one of the students has been wrongly entered as 74 instead of 32. What is the correct average? a) 68 b) 67 c) 71 d) 69

I4 8 Activate Windows

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Abhilash Kumar

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Teaching from 4 years in many recognize institutes of Kanpur.

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Shuvam Dey Roy

5 months ago

mam vande mataram anada math hobe na?

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