Chapter 4

Question 1

What do pie charts show and not show?

Answer 1

They show proportions NOT frequencies

Question 2

What is mode?

Answer 2

The most frequent value

- if there are 2 we call it bimodal if there’s more than 2 we say there is no mode

Question 3

What is the median?

Answer 3

Arrange dats in numerical order and the medium is the middle number, if there are two in the middle, add them up and divide by 2

Question 4

What is mean?

Answer 4

Mean= total
——
Number of values

Total = frequency X values

Question 5

What is range?

Answer 5

NOT AN AVERAGE but it’s the largest subtract the smallest value

Question 6

How do you work out median in a frequency table?

Answer 6

N+1
—— = median
2

N= add no. Of frequencies

Question 7

How do you work out mean in a frequency table?

Answer 7

N X frequency
(N= other value eg football goals)

Total frequencies

Question 8

How to work out mode in a frequency table?

Answer 8

Highest frequency

Question 9

What’s a histogram?

Answer 9

If multiply the X axis width of the bar by the y axis height of the bar = frequency

Area of bar = frequency 
Height = frequency density
Width = class width

Question 10

How do you get the frequency density in a histogram?

Answer 10

Width

…of bars