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Relative Frequency

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by

Mr Mattock

on 10 May 2016

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Transcript of Relative Frequency

Relative Frequency
Starter
Fractions or Decimals?
Relative Frequency
L.O. - To find relative frequency, understand it as an estimate of probability, and use it to judge fairness.
Why does one question use fractions and the
other question use decimals?
Main Activity
Complete the Red, Amber, Green
Activity sheet.
Red
1) i) 0.25 (ii) 0.2 (iii) 0.125 (iv) 0.625

2) i) 0.22 (ii) 0.24 (iii) 0.3 (iv) 0.8

Amber
4) (i) 0.075 (ii) 0.175 (iii) 0.75

5) (i) 0.1 (ii) 0.06 (iii) 0.83

Green
6) i) 0.13 (ii) 0.43 (iii) 0.7
7) (a) i) 0.22 (ii) 0.1 (b) 0.68
Starter
5/9

0.25
Relative Frequency
(a) 72
(b) (i) 8/72 = 0.1111... (ii) 6/72 = 0.08333... (iii) 12/72 = 0.16666...
(iv) 42/72 = 0.5833333... (v) 4/72 = 0.0555555....
Activities
Activity
Answers

Key
Examples

Worked
Example
Plenary
Stephan is told a certain event should have a probability of 0.3 if it is fair. Stephan tests this by trialling the event 100 times and recording the relative frequency every 10 trials. The graph shows the result. What should Stephan conclude?
Plenary
Stephan is told a certain event should have a probability of 0.3 if it is fair. Stephan tests this by trialling the event 100 times and recording the relative frequency every 10 trials. The graph shows the result. What should Stephan conclude?
Stephan should conclude that the event is fair because the relative frequency is settling to the same value as the given probability.
Full transcript