Question

Draw the histogram and frequency polygon .
Class interval Frequency
1-10 8
11-20 12
21-30 16

Answer 1

Answer:

the class intervals are not continuous

to make it continuous , use the formula : [ll of a class  interval - ul of the previous class interval] divided by 2 and subtract the difference from the ll of  

all the class interval and add to the ul of all the class intervals and thenn proceed as done in the other questions

Step-by-step explanation: