Given the following data, answer questions 2 - 8 concerning grouping data by classes with the first class being 7-17

7 20 36 43 57

50 32 14 9 41

10 35 50 26 23

9 11 19 36 40

8 31 47 21 52

How many classes are needed for the distribution? ______

6

4

5

none of these

What is the class width? _____

11

10

2

none of these

What is the lower boundary of the fourth class? _______

41

37

51

40

What is the class mark of the 5th class?

44

50

52

none of these

What is the frequency of the fifth class? ________

8

9

2

3

What is the range of the data?

45

10

50

none of these

What is the modal class?

7-17

40-50

17-27

none of these