Histograms Lesson 2

Question 1

What are bar charts?

Answer 1

For discrete data

Frequency given by height of bars

Question 2

What are histograms?

Answer 2

For continous data

data divided into (potenitally uneven) intervals

Frequency give by area of the bars

Question 3

80 < s _< 100 with a frequency of 24

Work out an estimate for the number of cars with a speed of more than 85km/h.

Answer 3

20 x ? = 24

1.2

100-85 = 15

15 x 1.2 = 18

Ans: 18