Question

6. For more than ogive the x-axis represents :

(a) upper limits of class-intervals (b) mid-values of class-intervals

(c) lower limits of class-intervals (d) frequency

7. Ogive is the graph of :

(a) lower limits and frequency (b) upper limits and frequency

(c)lower/upper limits and cumulative frequency (d) none of these

8. The curve less than ogive is always :

(a)ascending (b) descending

(c) sometimes ascending and sometimes descending (d) none of these

9. If mode = 80 and mean = 110, then the median is

(a)110 (b)120

(c)100 (d)90

10. The mean of the following data is : 45, 35, 20, 30, 15, 25, 40 :

(a) 15 (b) 25

(c) 35 (d) 30

11 . The mean and median of a data are 14 and 15 respectively. The value of mode is (a) 16 (b) 17

(c) 13 (d) 18

12 . For a given data with 50 observations the less than ogive and the more then ogive intersect at (15.5, 20). The median of the data is :

(a) 4.5 (b) 20

(c) 50 (d) 15.5

13. Which of the following is not a measure of central tendency ?

(a) Mean (b) Median

(c) Range (d) Mode

14. The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its :

(a)mean (b) median

(c) mode (d) all the three above

15. The measures of central tendency which cant be found graphically is

(a) mean (b) median

(c) mode (d) none of these

Answer 1

$$\begin{gathered} 9) \\ \mathrm{mode}=3\mathrm{median}-2\mathrm{mean} \\ 80+2\times 110=3\mathrm{median} \\ \mathrm{median}=100 \\ 10) \\ \mathrm{The}\mathrm{mean}\mathrm{of}45,35,20,30,15,25,40 \\ =\frac{45+35+20+30+15+25+40}{7} \\ =\frac{210}{7}=30 \end{gathered}$$