UnitUnitOneOne

Mean AverageMean Average

3, 5, 2, 63, 5, 2, 6

= 3 + 5 + 2 + 6 = 5.75= 3 + 5 + 2 + 6 = 5.75

44

ModeMode

4,5,3,2,4,6,14,5,3,2,4,6,1Most common or highest frequencyMost common or highest frequency

= 4= 4

MedianMedian

7, 5, 2, 6, 3, 47, 5, 2, 6, 3, 4

2, 3, 4, 5, 6 ,72, 3, 4, 5, 6 ,7

= 4.5= 4.5

Estimate of a Estimate of a MeanMean

mid-points x frequency mid-points x frequency

frequencyfrequency

ProbabilityProbability

Always adds up to 1Always adds up to 1

0 0.5 10.25 0.75

Pie chartsPie chartsTo find the anglesTo find the angles

360° ÷ total frequency360° ÷ total frequency

X by individual frequenciesX by individual frequencies

The RangeThe RangeLargest value – smallest valueLargest value – smallest value

3, 5, 6, 9, 123, 5, 6, 9, 12

12 - 3 = 912 - 3 = 9

CorrelationCorrelation

PositivePositive

NegativeNegative

NoneNone

x x

x

x

x

x

x

x

Line of best fitLine of best fit Draw a line through 2 pointsDraw a line through 2 points

Half the crosses either side of lineHalf the crosses either side of line

Make sure the line follows the trendMake sure the line follows the trend

To add and subtract To add and subtract fractionsfractions

the denominators the denominators must be the samemust be the same

RoundingRounding3768537685

To the nearest 10 . . 37690To the nearest 10 . . 37690

To the nearest 100 . . 37700To the nearest 100 . . 37700

To the nearest 1000 . . 38000To the nearest 1000 . . 38000

BiDMASBiDMASThe order of operationsThe order of operations BracketsBrackets IndicesIndices DivisionDivision MultiplicationMultiplication AdditionAddition SubtractionSubtraction

To multiply fractions To multiply fractions we multiplywe multiply

top x top top x topbottom x bottombottom x bottom

Simplify RatiosSimplify Ratios

4:10 = 2:54:10 = 2:5

2:7 = 2:72:7 = 2:7

125: 500 = 25:100 = 5:20 = 1:4125: 500 = 25:100 = 5:20 = 1:4

Sharing in RatiosSharing in RatiosShare £600 in the ratio 3:4:5Share £600 in the ratio 3:4:5

3+4+5 = 123+4+5 = 12

£600 ÷ 12 = £50£600 ÷ 12 = £50

So So

3x £50 = £150 4x£50 = £200 5 x £50 = £2503x £50 = £150 4x£50 = £200 5 x £50 = £250

£150:£200:£250£150:£200:£250