Question

The cumulative frequencies of each interval have been given. Use this information to complete the frequency column.
https://i.gyazo.com/ad3205b6fd86084b3bd6ccb6a80d2d35.png
6, 17, 6, 26, 15, 60, 74
6, 17, 9, 9, 34, 59
7, 30, 39, 48, 82, 141
7, 16, 16, 25, 50, 84

Answer 1

the cumulative frequency is the sum of the frequency column
the first frequency should be 6 because the sum (up to that point) is 6
the 2nd row shows the sum is 23, and that means
the first row + 2nd row is 23
first row is 6

so you figure out 6+ x = 23
add -6 to both sides to get x= 23-6 = 17

the 2nd entry is 17

now do the next row
23+ what number gives 32

Answer 2

Thank you for explaination, ^-^.
B, it is.