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Relative Frequency

Relative Frequency. What is to be learned?. How to calculate relative frequency How to use relative frequency for estimations. Relative Frequency. Very Basic Pets 6 cats, 10 dogs, 4 rabbits Proportion of dogs? 10 out of 20 → ½ or 0.5 or 50%. Relative Frequency of dogs.

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Relative Frequency

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  1. Relative Frequency

  2. What is to be learned? • How to calculate relative frequency • How to use relative frequency for estimations

  3. Relative Frequency Very Basic Pets 6 cats, 10 dogs, 4 rabbits Proportion of dogs? 10 out of 20 → ½ or 0.5 or 50% Relative Frequency of dogs

  4. Crisp Sales Relative Frequency Frequency Fraction Decimal % 30% 24/80 0.3 24 11 13 0.1625 11/80 16.25% 0.1375 13/80 13.75% 40% 32 0.4 32/80 100% 1 Total 80 1

  5. Using for Predictions Ordering 200 boxes of crisps 50 of each? Based on previous results Turnip 40% of 200 = 0.4 X 200 = 80 Beef 30% of 200 = 0.3 X 200 = 60 Chicken 16.25% → 0.1625 X 200 = 32.5 Prawn 13.75% → 0.1375 X 200 = 27.5 Would need to be whole numbers!

  6. Relative Frequency Measure of how much something occurs –its proportion. Can be a fraction decimal or percentage a/b → easy to calculate → easy to understand X 100 a÷b % Decimal

  7. Favourite Colour Relative Frequency Frequency Fraction Decimal % 17.5% 7/40 0.175 7 13 3 0.325 13/40 32.5% 0.075 3/40 7.5% 42.5% 17 0.425 17/40 100% 1 Total 40 1

  8. Find The Relative FrequenciesGive answers as % to 1 d.p. 1. Popular Flowers Daisies 48 Tulips 24 Roses 88 2. Calculator Sales Graphic 21 Scientific 34 Basic 36 3. Common Names of Dog Rover 13 Towser 16 Mutley 18 Cyril 2 30% 15% 55% 23.1% 37.4% 39.6% 26.5% 32.7% 36.7% 4.1%

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