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Find the mean deviation from the median for the following data.
| xi | 15 | 21 | 27 | 30 | 35 |
| fi | 3 | 5 | 6 | 7 | 8 |
Find the mean deviation about the mean for the following data.
| xi | 16 | 8 | 5 | 15 | 13 | |
| fi | 3 | 8 | 10 | 5 | 9 | 12 |
Calculate the mean deviation from the mean for the following data 6, 7, 10, 12, 13, 4, 8, 20.
Find the mean and variance for the following frequency distribution.
| Classes | 0–30 | 30–60 | 60–90 | 90–120 | 120–150 | 150–180 | 180–210 |
| Frequency (f) | 2 | 3 | 5 | 10 | 3 | 5 | 2 |
An analysis of monthly wages paid to workers in two firms A and B, belonging to the same industry, gives the following results
| Firm A | Firm B | |
| No. of wage earners | 586 | 648 |
| Mean of monthly wages | Rs 5253 | Rs 5253 |
| Variance of distribution of wages | 100 | 121 |
The coefficients of variation of two distributions are 50 and 60 and their standard deviations are 25 and 15, respectively. What are their arithmetic means?
Find the variance of the following data.
16, 18, 20, 22, 24, 6, 8, 10, 12, 14
The scores of a batsman in ten innings are : 38, 70, 48, 34, 42, 55, 63, 46, 54, 44. Find the mean deviation about the median.
The co-eff. of variation of two series are 58 % and 69 %. Their standard deviations are 21.2 and 15.2. what are their means ?
Find the mean deviation about the mean for the following data
6, 7, 10, 12, 4, 8, 12 and co-eff. of M.D. from mean.