Deciles and percentiles (Edexcel GCSE Statistics): Flashcards
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Find 4th decile position for n=50
Find 4th decile position for n=50
Position = (4/10)×50 = 20th value
Find 76th percentile position for n=50
Find 76th percentile position for n=50
Position = (76/100)×50 = 38th value
Formula: position of dth decile
Formula: position of dth decile
Position = (d/10) × n
Formula: position of Pth percentile
Formula: position of Pth percentile
Position = (P/100) × n
Find 3rd decile position for n=23
Find 3rd decile position for n=23
Position = (3/10)×23 = 6.9th; interpolate
Position of 4th decile when n=50?
Position of 4th decile when n=50?
20th value
Find 4th decile position for n=50
Find 4th decile position for n=50
Position = (4/10)×50 = 20th value
Find 76th percentile position for n=50
Find 76th percentile position for n=50
Position = (76/100)×50 = 38th value
Find 3rd decile position for n=45
Find 3rd decile position for n=45
Position = (3/10)×45 = 13.5th; interpolate
Calculate interpercentile range 20th to 80th
Calculate interpercentile range 20th to 80th
80th = 18 km, 20th = 5 km; range = 13 km