Maths non-calcultaor topics for revsion

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Histograms - How do you find frequency density?
Frequency density = Frequency / class width
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Interpreting a histogram - How do you find the frequency ?
Frequency = frequency density x class width.
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Name another way of interpreting a histogram ?
Finding the area of the bars
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How do you find the area of the bars ?
Frequency = frequency density x class width.
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Percentages - How do you increase by a multiplier ?
Add the percentage that you want to increase by to 100%, divide you answer by 100 and then the number you get, you then use.
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Percentages - How do you decrease by a multiplier ?
Take away the percentage you want to decrease by from 100%, divide that number by 100 and then that will give you your multiplier which you times the number you want to find the percentage of by.
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Cumulative frequency - What is cumulative frequency ?
It is a RUNNING TOTAL.
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What type of graphs are produced ?
Curved ones.
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On a cumulative frequency graph, how do you find the median ?
You find half of the cf and then draw a line over to where you hit the curve on the graph.
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How do you find the UPPER QUARTILE ?
you find 3/4 of the cf and draw a line across to find the UQ.
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How do you find the LOWER QUARTILE ?
You find 1/4 of the cf and draw a line across to find the LQ.
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How do you find the INTER QUARTILE RANGE (IQR)
You do the UPPER QUARTILE - LOWER QUARTILE.
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Arc length - how do you find the arc LENGTH?
Arc length = x divided by 360 x pie x the diameter
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Sector area - How do you find the area of a sector ?
area of a sector = x divided by 360 x pie R squared.
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Error in measurement- How do you find the error in measurement ?
+/- half the nearest unit of measurement, eg - 1cm =+/- 0.5
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Box and whisker plots - What is this topic usually linked with ?
Cumulative frequency
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Is the median always in the middle ?
No
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Draw a box and whisker plot using this data : shortest time - 18 minutes , lower quartile - 25 minutes, median - 29 minutes, upper quartile - 33 minutes and longest time - 44 minutes. the scale is that every one block is 5 minutes.
see page in reference book
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Compare the distributions of the girls times and the boys times.
Boys on average were quicker at completing their jigsaw puzzles because their median completion time is lower. The inter quartile range is shorter for the girls meaning they are more consistant with their timings.
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Other cards in this set

Card 2

Front

Interpreting a histogram - How do you find the frequency ?

Back

Frequency = frequency density x class width.

Card 3

Front

Name another way of interpreting a histogram ?

Card 4

Front

How do you find the area of the bars ?

Card 5

Front

Percentages - How do you increase by a multiplier ?