The following table gives the number of branches and number of plants in the garden of a school.
No. of branches (x): | 2 | 3 | 4 | 5 | 6 |
No. of plants (f): | 49 | 43 | 57 | 38 | 13 |
Let the assumed mean (A) = 4
No. of branches (xi) | No. of plants (fi) | ui = xi - A = xi - 4 | fiui |
2 | 49 | -2 | -98 |
3 | 43 | -1 | -43 |
4 | 57 | 0 | 0 |
5 | 38 | 1 | 38 |
6 | 13 | 2 | 26 |
N = 200 | ∑fiui = -77 |
Average number of branches per plant = A +
= 4 + =
= 3.62 (approx.)