Quiz on Math Set 331

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Quiz on Math Set 331 :

Question 1 :

In an exam, the average marks obtained by the students was found to be 60. After omission of computational errors, the average marks of 100 candidates had to be changed from 60 to 30 and the average with respect to all the examinees came down to 45 marks. The total number of candidates who took the exam, was 
A. 200
B. 210
C. 240
D. 180

Correct Ans: Option A

Question 2 :

The average of 18 observations is recorded as 124. Later it was found that two observations with values 64 and 28 were entered wrongly as 46 and 82. Find the correct average of the 18 observations.
A. 111(7/9)
B. 122
C. 123
D. 137(3/9)

Correct Ans: Option B

Question 3 :

A batsman in his 12th innings makes a score of 63 runs and there by increases his average scores by 2. What is his average after the 12th innings? 
A. 39
B. 13
C. 49
D. 87

Correct Ans: Option A

Question 4 :

In a 20 over match, the required run rate to win is 7.2. If the run rate is 6 at the end of the 15th over, the required run rate to win the match is 
A. 1.2
B. 13.2
C. 10.8
D. 12

Correct Ans: Option C

Question 5 :

A cricketer has a mean score of 60 runs in 10 innings. Find out how many runs are to be scored in the eleventh innings to raise the mean score to 62?
A. 83
B. 82
C. 80
D. 81

Correct Ans: Option B

Question 6 :

The batting average for 40 innings of a cricket player is 50 runs. His highest score exceeds his lowest score by 172 runs. If these two innings are excluded, the average of the remaining 38 innings is 48 runs. The highest score of the player is
A. 170 runs
B. 165 runs
C. 174 runs
D. 172 runs

Correct Ans: Option C

Question 7 :

The average of six numbers is 20. If one number is removed, the average becomes 15. What is the number removed ? 
A. 5
B. 35
C. 112
D. 45

Correct Ans: Option D

Question 8 :

The average age of 14 girls and their teacher’s age is 15 years. If the teacher’s age is excluded, the average reduces by 1. What is the teacher’s age? 
A. 32 years
B. 35 years
C. 30 years
D. 29 years

Correct Ans: Option D

Question 9 :

The average of marks of 28 students in Mathematics was 50; 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school ?
A. 37.5
B. 50.5
C. 45
D. 42.5

Correct Ans: Option A

Question 10 :

The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is
A. 25
B. 27
C. 35
D. 30

Correct Ans: Option C

Quiz Summary


Here the correct answers of every question in this quiz.

Q.1 [A],     Q.2 [B],     Q.3 [A],     Q.4 [C],     Q.5 [B],     Q.6 [C],     Q.7 [D],     Q.8 [D],     Q.9 [A],     Q.10 [C],    


Total Questions: 10
Your score:
Subject: Math
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