Unit 3 – Questions
- Define measures of central tendency?
- For the frequency distribution of weights of sorghum ear-heads given in table below. Calculate the median.
Weights of ear heads | No. Of ear heads |
60 -80 | 22 |
80 – 100 | 38 |
100 – 120 | 45 |
120 – 140 | 35 |
140 - 160 | 20 |
3. Calculate the mean
Marks | 64 | 63 | 62 | 61 | 60 |
No. Of students | 8 | 18 | 12 | 9 | 7 |
4. Find the geometric mean of the following values 15, 12, 13, 19, 10
5. Find the modal class and actual mode of the data set below
Number | Frequency |
1 - 3 | 7 |
4 – 6 | 6 |
7 – 9 | 4 |
10 – 12 | 2 |
13 – 15 | 2 |
16 - 18 | 8 |
6. Calculate the harmonic mean
Marks | 20 | 21 | 22 | 23 | 24 | 25 |
No. Of students | 4 | 2 | 7 | 1 | 3 | 1 |
7. For the following frequency distribution find the mean, median, mode
X | F |
10 - 14 | 5 |
15 - 19 | 2 |
20 – 24 | 3 |
25 – 29 | 5 |
30 – 34 | 2 |
35 - 39 | 9 |
40 - 44 | 6 |
8. Find the median of the following set of points in a game: 15,14,10, 8, 12, 8,16
9. Find the mode of the following set of score : 14, 11, 15, 9, 11 , 7, 13, 12
10. Find the mean of 8, 5, 7, 10, 15, 21
