1Which is the formula for finding mean deviation? Choose from: \( \frac{\Sigma fD}{N} \), \( \frac{\text{MD}}{M_d} \), \( \frac{\text{MD}}{\text{Mean}} \), \( \frac{\Sigma f|D|}{N} \).
2If all the items of a data are equal, what is the mean deviation? Choose from: 1, infinite, 0, cannot be said.
3From which measure of central tendency can mean deviation be calculated? Choose from: mean, median, mode, all of the above.
4If \( \Sigma f|m - \bar{X}| = 510 \), \( N = 30 \) and the mean is 40, what is the coefficient of mean deviation? Choose from: 12.75, 17, 0.425, 0.75.
5Calculate the mean deviation from the mean and its coefficient. Weight (kg): 0 - 4, 4 - 8, 8 - 12, 12 - 16, 16 - 20, 20 - 24. Number of children: 7, 7, 10, 15, 7, 6.
6Calculate the mean deviation from the mean and its coefficient. Marks: 0 - 10, 10 - 20, 20 - 30, 30 - 40, 40 - 50, 50 - 60. Number of students: 8, 12, 20, 40, 12, 8.
7Calculate the mean deviation from the median and its coefficient. Weight (kg): 20 - 30, 30 - 40, 40 - 50, 50 - 60, 60 - 70, 70 - 80. Number of students: 7, 12, 18, 28, 16, 14.
8Calculate the mean deviation from the median and its coefficient. Weight (kg): 3 - 5, 5 - 7, 7 - 9, 9 - 11, 11 - 13. Number of dogs: 1, 4, 6, 4, 1.
9In a mathematics test of 50 full marks, 10 students scored: less than 10: 1, less than 20: 3, less than 30: 7, less than 40: 9, less than 50: 10. (a) Find the mean deviation from the mean and its coefficient.
10For the same 10 students' marks (less than 10: 1, less than 20: 3, less than 30: 7, less than 40: 9, less than 50: 10), (b) find the mean deviation from the median and its coefficient.
11The hourly wages of workers in a factory are from Rs. 100 up to less than Rs. 800: more than 100: 60, more than 200: 56, more than 300: 50, more than 400: 40, more than 500: 20, more than 600: 10, more than 700: 4. Find the mean deviation from the mean and its coefficient.
12The marks of 28 students of class 10 in a mathematics test are: 15, 62, 50, 70, 74, 34, 60, 41, 14, 48, 28, 38, 64, 21, 57, 40, 34, 30, 47, 20, 75, 45, 56, 29, 22, 13, 53, 66. (a) Present the data in a frequency table whose first class is 10 - 20.
13For the 28 students' marks above, (b) find the mean deviation from the mean and its coefficient.
14For the 28 students' marks above, (c) find the mean deviation from the median and its coefficient.
15Why is the absolute value of each deviation used when finding mean deviation?
16Marks: 0 - 10, 10 - 20, 20 - 30, 30 - 40, 40 - 50. Students: 4, 11, 20, 10, 5. The mean is 25.2. Find the mean deviation from the mean and compare it with the mean deviation from the median, which is 7.8.
17The coefficient of mean deviation of the marks of section A is 0.18 and that of section B is 0.27. Which section's marks are more uniform? Why is the coefficient used here and not the mean deviation?
18What does the mean deviation of the weights in a class being 7.875 kg mean?