For 80 observations, the cumulative frequencies below 10, 20, 30, 40 and 50 are 6,22,49,70,806,22,49,70,806,22,49,70,80.
Find the five class frequencies.
State the classes containing the median and upper quartile.
Explain why their exact values cannot be recovered from this table.
105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.