class IX statistics

                                                      class--IX  statistics  

                                                      MCQ

1.The class mark of the class 90-120 is

(a) 90    ( b) 105         (c) 115             (d) 120

2.In a frequency distribution, the mid value of a class is 10 and the width of the class is 6. The lower

limit of the class is

(a) 6      (b) 7    (c) 8        (d) 12

3.Let m be the mid-point and / be the upper class limit of a class in a continuous frequency distribution.

The lower class limit of the class is

(a) 2m+l            (b) 2m-l            (c) m-l           (d) m-2l

4.The class marks of a frequency distribution are given as follows:

15, 20, 25, ..

The class corresponding to the class mark 20 is

(a) 12.5-17.5    (b) 17.5-22.5           (c) 18.5-21.5           (d) 19.5-20.5

5.The mean of 100 observations is 50. If one of the observations which was 50 is replaced by 150, the

resulting mean will be

(a) 50.5    (b) 51       (c) 51.5    (d) 52

6.The mean of 25 observations is 36. Out of these observations if the mean of first 13 observations is

32 and that of the last 13 observations is 40, the 13th observation is

(a) 23          (b) 36             (c) 38               (d) 40

7.Mode of the data

15, 14, 19, 20, 14, 15, 16, 14, 15, 18, 14, 19, 15, 17, 15 is

(a) 14            (b) 15       (c) 16      (d) 17

8.In a grouped frequency data, class intervals are 0-20, 20-40, 40-60, .... , then the width is

(a) 10          (b) 30         (c) 20        (d) 15

9. The maximum value of the data is 57 and range is 20, then the minimum value is

(a) 77        (b) 27            (c) 20        (d) 37

10.Given the class intervals 1-10, 11-20, 21-30, ... , then 20 is in class interval

(a) 11-20             (b) 21-30          (c) 11-30                            (d) 15-25

11.In a continuous frequency distribution, class mark of a class is 85 and lower limit is 83, then its upper

limit is

(a) 86                 (b) 84        (c) 83     (d) 87

12.In a given data, some variables are given with particular values, we want to represent these graphically,

then we can represent these, using

(a) Histogram                                                                (b) Frequency polygons

(c) Bar graph (horizontal)                                            (d) Bar graph (vertical)

13.Mean of 36 observations is 12. One observation 47 was misread as 74, then corrected mean is

        (a) 11.5             (b) 13.5          (c)135/12          (d)45/2

14.Mode of the data 4, 6, 9, 6, 4, 2, 4, 8, 6, 4, 3, 4, 6 is

         (a) 6              (b) 4               (c) 3              (d) 2

15.     Median of the data 32, 15, 27, 8, 15, 12, 9 is

         (a) 8            (b) 21               (c) 12             (d) 15