Estimating the median (Edexcel GCSE Statistics): Flashcards
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Practise the cards
9 cards from this deck
Which class interval contains the median?
Which class interval contains the median?
Where cumulative frequency just exceeds n/2
How is frequency density calculated?
How is frequency density calculated?
Frequency divided by class width
Why is the median possibly a decimal?
Why is the median possibly a decimal?
Median position may be a decimal, expected in answer
Estimate median: lower boundary 5 plus width 3.5
Estimate median: lower boundary 5 plus width 3.5
Estimated median = 8.5
Calc total n from 10×3,5×7,10×4,15×5,10×1
Calc total n from 10×3,5×7,10×4,15×5,10×1
n = 190
Estimate median: lower 35 and width needed 7.5
Estimate median: lower 35 and width needed 7.5
Estimated median = 42.5 years
Estimate median: lower boundary 5 plus width 3.5
Estimate median: lower boundary 5 plus width 3.5
Estimated median = 5 + 3.5 = 8.5
Find median position and class: n=190, cum freqs 30,65,105,190
Find median position and class: n=190, cum freqs 30,65,105,190
95; in 35<y≤45 (3rd class)
Estimate median: lower=35, cum before=65, density=4, pos=95
Estimate median: lower=35, cum before=65, density=4, pos=95
Median = 35 + (95-65)/4 = 42.5