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Maths > Section 7 - Probability And Statistics > Flashcards

Section 7 - Probability And Statistics Flashcards

1
Q

What are all probabilitys between

A

0 and 1

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2
Q

How can you list all possible outcomes

A

A sample space diagram

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3
Q

When do the denominators in frequency trees change

A

The event is dependent

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4
Q

How to get end probabilities from a tree diagram

A

Multiply the branches

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5
Q

On a set of branches in a probability tree that meet at any point, what must the 2 numbers add to

A

1

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6
Q

To find probabilities from a Venn diagram you should

A

Convert to fractions by adding up all people in Venn diagram for denominator

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7
Q

What is the mode

A

Most common

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8
Q

What is the median

A

Middle value

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9
Q

How to find mode from a frequency table

A

The category with the most entries

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10
Q

How to find the range in a frequency table

A

Highest and lowest numbers from first column

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11
Q

How to find the median in a frequency table

A

Category containing middle value

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12
Q

How to work out mean using frequency table

A

3rd column total ÷ 2nd Column total

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13
Q

Third column in a frequency table equals

A

First column × second column

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14
Q

What are the upper/ lower quartile

A

1/4 and 3/4

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15
Q

How to find interquartile range

A

Difference between upper and lower quartile

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16
Q

How to plot a cumulative frequency graph

A

Add a culmative frequency column to graph given. The culmative frequency is just the frequency plus the frequencys that came before it.

E.g 4
9+4
13+20
33+42

Plot points using highest value in each class and the culmative frequency

Join with smooth curve

17
Q

How to find upper/ lower quartile on cumulative graph. And the median

A

Go up 1/4 or 3/4 of the way

Go half way

18
Q

What do histograms show

A

Frequency dencity

19
Q

How to work out vertices axis on histogram

A

Frequency density = frequency ÷ class width

20
Q

How do you find out how much a bar in a histogram represents

A

F = fd × class width = area of bar

21
Q

In a scatter graph strong correlation =
Positive

A

The points are all close together

They are going upwards

22
Q

Total of everything in pie chart =

A

360

23
Q

For a stem and leaf diagram

A

The unit goes on the right and the ten number goes on the left

Maths (7 decks)

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