Below is the frequency distribution of the weights (in kg) of some sample of teen-agers.

Weight(in kg) f

41-45 2

46-50 5

51-55 7

56-60 4

61-65 1

66-70 1

1. How many respondents were in the study?

2. What is the mean weight of the group?

3. Which is the median class?

4. What is the lower boundary of the median class?

5. What is , the less than cumulative frequency below the before the class?

6. What is the frequency of the median class?

7. What is the width of the median class?

8. What is the median score?

9. Which is the modal class?

10. What is the modal score?