Mode and median (Edexcel GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
What is the modal class in grouped data?
What is the modal class in grouped data?
Class with the highest frequency in the data
How to find the median class in grouped data?
How to find the median class in grouped data?
Locate class containing the median position via cumulative frequency
Formula for estimating median in grouped data?
Formula for estimating median in grouped data?
L + ((0.5n - F) / f) × w
How do you determine the median class from cumulative frequency?
How do you determine the median class from cumulative frequency?
Find where the median position falls in cumulative totals
Why can't we find exact median from grouped data?
Why can't we find exact median from grouped data?
Data values are only estimated, not precise
Find modal class: frequencies 5, 12, 9, 20, 7
Find modal class: frequencies 5, 12, 9, 20, 7
Modal class = interval with highest frequency (20)
Calculate median position for n = 91
Calculate median position for n = 91
Median position = (n + 1) ÷ 2 = 46th value
State meanings of L, n, F, f, w in median formula
State meanings of L, n, F, f, w in median formula
L lower bound; n total freq; F cum before class; f class freq; w width
For n=91, state median position and median class.
For n=91, state median position and median class.
46th; median class 25≤N<35 (cumulative freq = 54)
Estimate median using formula with L=25, n=91, F=38, f=16, w=10
Estimate median using formula with L=25, n=91, F=38, f=16, w=10
29.7 (to 3 s.f.)