Mathematics
A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.
| Number of plants | Number of houses |
|---|---|
| 0 - 2 | 1 |
| 2 - 4 | 2 |
| 4 - 6 | 1 |
| 6 - 8 | 5 |
| 8 - 10 | 6 |
| 10 - 12 | 2 |
| 12 - 14 | 3 |
Which method did you use for finding the mean and why ?
Related Questions
Consider the following distribution of daily wages of 50 workers of a factory.
Daily wages (in ₹) Number of workers 500 - 520 12 520 - 540 14 540 - 560 8 560 - 580 6 580 - 600 10 Find the mean daily wages of the workers of the factory by using an appropriate method.
The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is ₹ 18. Find the missing frequency f.
Daily pocket allowance (in ₹) Number of children 11 - 13 7 13 - 15 6 15 - 17 9 17 - 19 13 19 - 21 f 21 - 23 5 23 - 25 4 Thirty women were examined in a hospital by a doctor and the number of heartbeats per minute were recorded and summarised as follows. Find the mean heartbeats per minute for these women, choosing a suitable method.
Number of heartbeats per minute Number of women 65 - 68 2 68 - 71 4 71 - 74 3 74 - 77 8 77 - 80 7 80 - 83 4 83 - 86 2 In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes.
Number of mangoes Number of boxes 50 - 52 15 53 - 55 110 56 - 58 135 59 - 61 115 62 - 64 25 Find the mean number of mangoes kept in a packing box. Which method of finding the mean did you choose ?