exam on average

1. Find the Average of square of first 17 natural no.

2. The Average of 9 observations is 87. If the Average of first five observations is 79 and the Average of next three is 92. Find the 9th observation.

3. The Average of 7 data is 34 and the Average of first 3 data is 28 and the Average of next two data is 47. Find the average of last 2 data.

4.The Avarage of 8 number is 20. The avg. of first two number is 15.5 and the avg. of next 3 number is 21 1\3 . If the 6th no. is 4 less than the 7th and 7 less then the 8th number Find the 8th number ?

5. The average age of 30 students of a class is 14 years 4 months. Due to of the younger one among new 5 students is 9 years 11 months. Find the average of remaining four new studentsadmission of 5 new students the average becomes 13 years 9 months, while the age

6. 9 Girls and 1 Boy go to a restaurant for lunch. If each girl spent ` 30 and boy spent ` 72000 more than the average of expenditures of all. Find the amount spent by the boy.

7. The average age of mother, father and son was 42 years at the time of the marriage of the son. After 1 year an infant was born and after 6 years of marriage the average age of the family becomes 36 years. Find the age of the bride at the time of the marriage.

8. The average temp from Monday to Wednesday is 37ºC while the average temp from Tuesday to Thursday is 34ºC. The temp of Thursday is 4/5 times to that on Monday. Find the temp on Thursday

9.There were 42 students in a Hostel due to admission of 13 new students expense of mess is increased by Rs. 30 per day while per day expenditure per student is reduced by Rs. 3. What was the original expenditure of mess per day.

10. There are 4 natural no. if average of any 3 no. is added with 4th no. 29, 23, 21 and 17 will be obtain find all 4 natural no.?

11. There are 3 natural no. if average of any 2 no. is added to the third no. 24, 20 and 18 will be obtained. Find all the natural no. 15. There are 3 natural no. if average of any 2 no. is added to the third no. 24, 20 and 18 will be obtained. Find all the natural no.

12. The average age of boys of a school is 12 years and of girls is 11 years. If the total no. of boys is 480. Then find the no. of girls if the average age of school 11 years 9 months.

13. If the bowling average of a bowler is 12.4 run per wicket. He takes 10 wickets in his next innings by giving 52 runs, due to this his bowling average is improved by 0.4 run per wicket. Find the total no. of wickets taken by him at present.

14. A batsman scores 87 runs in his 17th innings due to this his average increased by 3 runs. Find his current average.

15. The average weight of some students in a class is 43 kg. When 4 new students are included the average weight becomes 42.5 kg and the weight of those 4 students are 42, 36.5, 39 and 42.5 kg. Find the total no. of students in the class. (a) 20 (b) 24 (c) 22 (d) 30

16. A batsman has an average of 30 runs in his 42 innings. The difference between his max. and min. score is 100. If these 2 innings are removed his average for 40 innings comes down to 28. What is his max. score?

17. A batsman in his 16th innings makes a score of 60 and there by increase his average by 3. What is his average after 16th innings ?

18. The average of five consecutive natural number is m. If the next three natural numbers are also included, how much more than m will the average of these numbers be?

19. The average of four positive integers is 72.5. The highest integer is 117 and the lowest integer is 15. The difference between the remaining two integers is 12. Which is the higher of these two remaining integer ?

20. The average of nine consecutive odd numbers is 53. The least odd number is :

21. The average of 10 numbers, a student, by mistake, wrote 64 in place of a number 46 and got his correct average 50. The correct average of the given numbers is:

22. The average of 27 numbers is 60. If one number is changed from 28 to 82, the average is :

23. Eight consecutive numbers are given. If the average of the two numbers that appear in the middle is 6, then the sum of the eight given numbers is:

24. If the mean of 4 observations is 20, when a constant ‘C’ is added to each observation, the mean becomes 22. The value of C is:

25. The average weight of the 8 oarsmen in boat is increased by 2 1 1 kg when one of the crew who weighs 60 kg is replaced by a new man. The weight of the new man in kg is :c

27. If a,b,c,d,e,f,g are seven consecutive even integers, then what is their average ?

28. A car owner buys petrol at Rs.60, Rs.80, Rs.48 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs.12000 each year?

29. A cricketer has a certain average for 10 innings. In the eleventh innings, he scored 158 runs, thereby increasing his average by 10 runs. His new average is :

30. A man buys a certain number of oranges at 20 for Rs.60 and an equal number at 30 for Rs.60. Find average rate of a orange?