please find the answers bellow :
1. The arithmetic mean of a set of 10 numbers is 20. If each number is first multiplied by 2 and then increased by 5, then what is the mean of new numbers?
(a) 20 (b) 25 (c) 40 (d) 45
2. The mean of 25 observations is 36. The mean of first 13 observations is 32 and that of last 13 observations is 39. What is the value of 13th observation?
a. 20 b. 23 c. 32 d. 40
3. The average age of 06 persons living in a house is 23.5 years. Three of them are majors and their average age is 42 years. The difference in ages of the three minor children is same. What is the mean of the ages of minor children?
a. 3 years b. 4 years c. 5 years d. 6 years
4. What is the weighted mean of first 10 natural numbers whose weights are equal to the corresponding number?
a. 7 b. 5.5 c. 5 d. 4.5
5. In a class of 45 students a boy is ranked 20th. When two boys joined, his rank was dropped by one. What is his new rank from end?
a. 25th b. 26th c. 27th d. 28th
6. The mean age of combined group of men and women is 25 years. If the mean age of group of men is 26 and that of group of women is 21, then percentage of men and women in the group respectively is:
a. 60, 40 b. 80, 20 c. 30, 70 d. 50, 50
7. Sum of mode and median of the data
12, 15, 11, 13, 18, 11, 13, 12, 13
a. 26 b. 31 c. 36 d. 25
8. The arithmetic mean (average) of the first ten whole numbers is
a. 5.5 b. 5 c. 4 d. 4.5
9. The mean of 9 observations is 16. One more observation is included and the new mean becomes 17. The 10th observation is
a. 18 b. 26 c. 30 d. 7
Answers : 1. D, 2. B, 3. C, 4. A, 5. C, 6. B, 7. A, 8. D, 9. B.
1. The arithmetic mean of a set of 10 numbers is 20. If each number is first multiplied by 2 and then increased by 5, then what is the mean of new numbers?
(a) 20 (b) 25 (c) 40 (d) 45
2. The mean of 25 observations is 36. The mean of first 13 observations is 32 and that of last 13 observations is 39. What is the value of 13th observation?
a. 20 b. 23 c. 32 d. 40
3. The average age of 06 persons living in a house is 23.5 years. Three of them are majors and their average age is 42 years. The difference in ages of the three minor children is same. What is the mean of the ages of minor children?
a. 3 years b. 4 years c. 5 years d. 6 years
4. What is the weighted mean of first 10 natural numbers whose weights are equal to the corresponding number?
a. 7 b. 5.5 c. 5 d. 4.5
5. In a class of 45 students a boy is ranked 20th. When two boys joined, his rank was dropped by one. What is his new rank from end?
a. 25th b. 26th c. 27th d. 28th
6. The mean age of combined group of men and women is 25 years. If the mean age of group of men is 26 and that of group of women is 21, then percentage of men and women in the group respectively is:
a. 60, 40 b. 80, 20 c. 30, 70 d. 50, 50
7. Sum of mode and median of the data
12, 15, 11, 13, 18, 11, 13, 12, 13
a. 26 b. 31 c. 36 d. 25
8. The arithmetic mean (average) of the first ten whole numbers is
a. 5.5 b. 5 c. 4 d. 4.5
9. The mean of 9 observations is 16. One more observation is included and the new mean becomes 17. The 10th observation is
a. 18 b. 26 c. 30 d. 7
Answers : 1. D, 2. B, 3. C, 4. A, 5. C, 6. B, 7. A, 8. D, 9. B.
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