Cumulative Frequency Flashcards

1
Q

How do you make a cumulative frequency column?

A

Add the frequencies together as you move down the frequency table

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2
Q

How do you plot a Cumulative Frequency Graph?

A

Plot the upper class limit against the cumulative frequency
Join the points with a straight line.

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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.

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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

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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 cumulative frequency.
Subtract this amount off the total frequency.

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