Question

pls solve correctly​

Answer 1

Step-by-step explanation:

cumulative frequency is the sum of the frequency of the preceding one with the given one

thus

5 + 7 = x1

x1 = 12

similarly

x1 + x2 = 18

x2 = 18 - 12 = 6

also

18 + 5 = x3

x3 = 23

x3 + x4 = 30

x4 = 30 - 23 = 7

x4 = 7

Answer 2

Step-by-step explanation:

The sum of the frequency of a certain class and all the frequencies of previous classes is called as cumulative frequency less than the upper class limit for that given class

x1=12

x2=6

x3=23

x4=7 .