A. 7

**B. 9**

C. 12

D. 8

Submitted by: **KAMRAN ARSHED**

Advertisement

### Related Mcqs:

- The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is___________?
A. 45

B. 50

**C. 51.4 approx.**

D. 54.6 approx. - If the arithmetic mean of seventy five numbers is calculated, it is 35. If each number is increased by 5, then mean of new number is___________?
A. 30

**B. 40**

C. 70

D. 90 - The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is___________?
A. 35.2

B. 36.1

**C. 36.5**

D. 39.1 - The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.
A. 57.4

B. 57.5

C. 58.9

**D. 59.1** - A swimming bath is 24 m long and 15 m broad. When a number of men drive into the bath. The height of water rises by 1cm. If the average volume of water displaced by each man be 0.1m3 how many mean are there in the both?
A. 32

**B. 36**

C. 42

D. 46 - Find the mean proportion between 5 and 45.
A. 9

**B. 15**

C. 25

D. 50 - The average of four positive integers is 69. The highest integer is 93 and the least integer is 39. The difference between the remaining two integers is 28. Which of the following integers is the higher of the remaining two integers?
A. 58

**B. 86**

C. 49

D. None of these - The average age of M boys is ‘b’ years and of ‘n’ girls ‘c’ years. The average age of all together is_________?
A. (mb – nc)/ (m + n) years

B. (mb + nc)/ (m – n) years

**C. (mb + nc)/ (m + n) years**

D. (mb – nc)/ (m – n) years - The average of 11 results is 50, if the average of first six results is 49 and that of the last six is 52. Find the sixth result?
A. 46

**B. 56**

C. 34

D. 57 - The average age of seven persons sitting in a row facing east is 28 years. If the average age of the first three persons is 21 years and the average age of the last three persons is 34 years, then find the age of the person sitting in the middle of the row?
A. 30 Years

**B. 31 years**

C. 26 years

D. 33 years

Advertisement

## 2 Comments

To find the arithmetic mean of a set of data, you add up all the values in the set and then divide by the total number of values.

In this case, the set of data is {3, 6, 9, 12, 15}, and there are five values in the set. So we add up all the values:

3 + 6 + 9 + 12 + 15 = 45

And then we divide by the total number of values:

45 / 5 = 9

Therefore, the arithmetic means of the data set {3, 6, 9, 12, 15} is 9.

you should take a English test yourself before uploading mcqs