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- Question
The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?
Options- A. 6
- B. 8
- C. 4
- D. 5
- Correct Answer
- 4
ExplanationLet the number of boys in the group originally be x.
Total weight of the boys = 30x
After the boy weighing 35 kg joins the group, total weight of boys = 30x + 35
So 30x + 35 + 31(x + 1) = > x = 4. - 1. A cicketer bas a certain average for 10 innings, In the eleventh inning, he scorod 108 runs, thereby increasing his average by 6 runs. His new average is :
Options- A. 44 runs
- B. 46 runs
- C. 48 runs
- D. 49 runs Discuss
- 2. The average age of the district level hockey team of eleven is 22 years.The average age gets increased by 1 year when the coach age is also included.what is the age of the coach ?
Options- A. 33 yrs
- B. 34 yrs
- C. 35 yrs
- D. 36 yrs Discuss
- 3. Sripad has scored average of 65 marks in three objects. In no subjects has he secured less than 58 marks. He has secured more marks in Maths than other two subjects. What could be his maximum score in Maths ?
Options- A. 79
- B. 77
- C. 76
- D. 73 Discuss
- 4. The average cost of 5 items in a shopping list is Rs 650. If one more item whose cost is Rs 1400 is added to the list what will be the new average (in Rs)?
Options- A. 775
- B. 875
- C. 725
- D. 825 Discuss
- 5. The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 is :
Options- A. 49/7
- B. 19/7
- C. 50/7
- D. 18/7 Discuss
- 6. The average marks of 40 students in an examination was 34. It was later found that the marks of one student had been wrongly entered as 62 instead of 26. what is the correct average?
Options- A. 33.1
- B. 33.3
- C. 33.5
- D. 33.7 Discuss
- 7. What is the average of first 19 odd numbers?
Options- A. 9.5
- B. 15.5
- C. 19
- D. 38 Discuss
- 8. The average weight of P, Q and R is 47 kg. If the average weight of P and Q be 32.5 kg and that of Q and R be 48.5 kg, then what is the weight of Q (in kgs)?
Options- A. 25
- B. 29
- C. 21
- D. 33 Discuss
- 9. The average marks of 40 students in an examination was 25. It was later found that the marks of one student had been wrongly entered as 73 instead of 37. What is the value of correct average?
Options- A. 24.3
- B. 24.1
- C. 24.5
- D. 24.7 Discuss
- 10. For the data given below. find the sum of mode. median and mean.6, 3, 8, 4, 3, 11, 7, 4, 5, 4.
Options- A. 13.5
- B. 13
- C. 14
- D. 14.5 Discuss
Average problems
Search Results
Correct Answer: 48 runs
Explanation:
Let average for 10 innings be x. Then,
(10x + 108)/11 = x + 6 => 11x + 66 = 10x + 108 => x = 42.
New average = (x + 6) = 48 runs.
Correct Answer: 34 yrs
Explanation:
Total age of players in team = 22 x 11 = 242
When coach is included, total members = 12, Avg age increases by one becomes 23
Total age when coach is included = 23x12 = 276
Age of coach = 276-242 = 34 yrs.
Correct Answer: 79
Explanation:
Assuming Sripad has scored the least marks in subject other than science,
Then the marks he could secure in other two are 58 each.
Since the average mark of all the 3 subject is 65.
i.e (58+58+x)/3 = 65
116 + x = 195
x = 79 marks.
Therefore, the maximum marks he can score in maths is 79.
Correct Answer: 775
Correct Answer: 18/7
Correct Answer: 33.1
Correct Answer: 19
Correct Answer: 21
Correct Answer: 24.1
Correct Answer: 14
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