Measures of dispersion for grouped data (Edexcel GCSE Statistics): Flashcards
📚Flashcards
Practise the cards
9 cards from this deck
ShowHide
Practise the cards
9 cards from this deck
How do you find , the first quartile?
How do you find , the first quartile?
Locate the 25% position using cumulative frequency
What is the method to find quartiles using grouped data?
What is the method to find quartiles using grouped data?
Use cumulative frequency and linear interpolation
How is the interquartile range (IQR) calculated?
How is the interquartile range (IQR) calculated?
IQR = Q_3 - Q_1
When finding quartiles, what should you show clearly?
When finding quartiles, what should you show clearly?
Your working, especially interpolation steps
Calculate IQR from Q1=4.41 and Q3=14.1
Calculate IQR from Q1=4.41 and Q3=14.1
IQR = 14.1 - 4.41 = 9.69 km
Find Q2: class 5<x≤10, CFbefore=34, pos=60
Find Q2: class 5<x≤10, CFbefore=34, pos=60
Q2 = 5 + ((60−34)/38)×5 ≈ 8.40 km
IQR if Q1=4.41 and Q3=14.1?
IQR if Q1=4.41 and Q3=14.1?
IQR = 14.1 − 4.41 = 9.69 km
Find Q1: 0<x≤5 class, position 30, f=34, c=5
Find Q1: 0<x≤5 class, position 30, f=34, c=5
Q1 ≈ 4.41 km (0 + (30/34)×5 ≈ 4.41)
Find IQR given Q1=4.41 and Q3=14.1
Find IQR given Q1=4.41 and Q3=14.1
IQR = 14.1 − 4.41 = 9.69 km