Statistics
Question 1:
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 |
0 − 2 |
2 − 4 |
4 − 6 |
6 − 8 |
8 − 10 |
10 − 12 |
12 − 14 |
Number of houses |
1 |
2 |
1 |
5 |
6 |
2 |
3 |
Which method did you use for finding the mean, and why?
Answer:
To find the class mark (x_{i}) for each interval, the following relation is used.
Class mark (x_{i}) =
x_{i }and f_{i}x_{i} can be calculated as follows.
Number of plants |
Number of houses (f_{i}) |
x_{i} |
f_{i}x_{i} |
0 − 2 |
1 |
1 |
1 × 1 = 1 ... |
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