The following is the data set for specific research regarding a certain product

15	19
14	20
13	23
16	25
17	12
20	11
23	10
14	11
25	12
11	15
8	17
8	18
16	19
17	19
24

What is the range of the data set?

How many class intervals should be constructed?

How many elements does the class width has?

What is the frequency of the class interval with the highest value?

What is the >cf of the 3rd to the highest class interval?