H Cumulative Frequency Flashcards
1
Q
How do you make a cumulative frequency column?
A
Collect the frequencies together as you move down the frequency table
2
Q
How do you plot a Cumulative Frequency Graph?
A
Plot the upper class limit against the c.f.
Join the points with a straight line.
3
Q
How do you find the Median from a C.F. Graph?
A
Find the total frequency.
Divide by two.
Draw a line across at this point.
Read the value on the x-axis.
4
Q
How do you find the IQR from a Cumulative Frequency graph?
A
Read the c.f. graph at the Upper quartile and the Lower quartile (of the total frequencies).
IQR = UQ - LQ
5
Q
How do you find how many people were higher than a given amount?
A
Find the given amount on the x-axis.
Draw a line up at this point.
Read the frequency.
Subtract this amount off the total frequency.
