Complete the less than cumulative frequency distribution for systolic pressure readings (in millimeters of mercury, mm Hg) of 200 randomly selected high school teachers below and answer the following.

Systolic blood pressure readings (mm Hg)
90-104
1) ____
120-134
135-149
5)____
165-179

Number of teachers
24
62
3)_____
4)_____
12
7)_____

Less than Cumulative Frequency (<CF)
24
2)_____
158
184
6)_____
200

Questions:
1)What is the class size of the intervals?
2)In which class interval you can locate the 28th percentile?
3)What is the frequency of the 65th percentile class?
4)What is the lower class boundary of the upper quartile class?
6)In which class interval you can locate the 8th decile?

(just pretend the Systolic BPR(mm Hg),Num.of teachers and <CF is in a graph coz I can't capture the picture).​