Data Handling Worksheet-2

Data Handling Worksheet-2

1. The mean of 10 observation is 25. If one observation, namely 25, it deleted, the new mean is

(a) 25                  (b) 20                 (c) 28                  (d) 22

2. Mean of a set of observations is the value which

(a) Occurs most frequently

(b) Divides observations into two equal parts

(c) Is a representative of whole group

(d) Is the sum of observations

3. If each entry of a data is increased by 5, then the arithmetic mean

(a) Remains the same                 (b) Increases by 5

(c) Decreases by 5                        (d) None of the forgoing

4. The arithmetic mean of five given number is 85. Their sum is

(a) 425                                            (b) 85

(c) Between 85 and 425              (d) More than 425

5. The daily earnings (in rupees) of 9 workers in a factory are 8, 16,    19, 8, 16, 19, 8, 19, 16, the median wage is

(a) Rs. 17.50     (b) Rs. 8.00      (c) Rs. 19.00     (d) Rs. 16.00

6. The average weight of sample of 10 apples is 52 g. Later it was found that the weighing machine had shown the weight of each apple 10 g less. The correct average weight of an apple is

(a) 62 g              (b) 54 g              (c) 56 g               (d) 52 g

7. The mean of 6, y, 7, x and 14 is 8. Then

(a) x + y = 13                                 (b) x – y = 13

(c) 2x + 3y = 13                             (d) x² + y² = 15

8. The mean of 994, 996, 998, 1000 and 1002 is

(a) 992               (b) 1004             (c) 998               (d) None

9. The mode of a set of observations is the value which

(a) Occurs most frequently

(b) Is central

(c) Is between maximum and minimum

(d) none of the foregoing

Answer Key:

(1)-(a); (2)-(c); (3)-(b); (4)-(a); (5)-(d); (6)-(a); (7)-(a); (8)-(c); (9)-(a)