Mean
Sum of all the data then divided by the number of pieces of data
Median
Middle value when the data is arranged in ascending numerical order
Mode
Most common or most frequent value
What is the measure of dispersion
Range + IQR
Range
Highest value - lowest value
How to solve for mean in a frequency table
Sigma f x divided by sigma f
How to get the x colum in grouped frequency tables
Middle of the group
Where do u get sigma f
Frequency colum
Where do u get sigma f x
Frequency x colum
What is an Advantage of a stem and leave diagram
That the raw data is visible
Facts about a stem and leaf
The ‘stem’ r in numerical order
Each ‘leaf’ r in numerical order
The key shows how to read the diagram
The diagram should have a title
What does the IQR range measure
How spread out the middle 50% of the data is . Not affected by the extreme outsliars
How is LQ calculated
It’s the exact half of the middle of the data
How is the upper quartile calculated
The exact middle of the second half of the data is arranged
When comparing box plots what to comments can you make
Median- on average group A performed higher/same/lower than group b
Range or IQR- group A results were more/as/less consistent than those of group b
What is cumulative frequency plotted with
The upper value of each group against rhe cumulative frequency
How is an intersection represented
A n B (a znd b will be dif compared to what’s the diagram about )
How is union represented
It’s everything
A u b
How would not a be represented
A’
Calculate HCF of 2 x 3 x 3 x4 and 3x 2 x4 x5
Because 2 and3 and 4 appear in both u times them all to get ur HCF
Calculate LCM of 2 x 3 x 3 x4 and 3x 2 x4 x5
Because 2 and 3 and 4 apear in both u would write
2 x 3 x 4 and then times it by the ones left over so it would be
2 x 3 x 4 x3 x 5
How to get % change
Diff
——- x 100
Orig
What is simple interest
Same amount oaid every year
What is compound interest
Interest changes every year
