List I (measures of Dispersion) | List II (Formula) | ||
A. | Range | I. | \(\sqrt[2]{\sum d^2/N}\) |
B. | Mean deviation | II. | Q3-Q1 |
C. | Standard Deviation | III. | H.V - S.V. |
D. | Interquartile Range | IV. | ∑dx / N |
Find the mean and mode of the following data:
Class | 15--20 | 20--25 | 25--30 | 30--35 | 35--40 | 40--45 |
Frequency | 12 | 10 | 15 | 11 | 7 | 5 |