Cumulative Frequency

Question 1

How is the cumulative frequency calculated

Answer 1

By adding up the frequencies

Question 2

What is the first number you plot on a cumulative frequency graph

Answer 2

The first number you plot is the lower boundary of the first class interval

Question 3

What shape does the cumulative frequency line use look like

Answer 3

It should look like an ‘s’

Question 4

How do you work out the median on a c.f line

Answer 4

You take the highest value and divide it by two then go across to the line and down to the x axis

Question 5

What is cumulative frequency

Answer 5

It is a running total

Question 6

How do you work out the LQ of a cumulative frequency graph

Answer 6

You half the median then put your finger on that number you then draw a line across and down to the x axis

Question 7

How do you work out the UQ on a cumulative frequency graph

Answer 7

You add the LQ to the median and get the upper quartile which you then put your finger on and go across to the line and down to the x axis