Question

Average daily temperatures (°C) in a northern city over a period of 60 days are presented in the partly completed grouped frequency distribution table below. Determine the missing values and complete the table.

Class	Frequency	Relative Frequency	Cumulative Frequency	Cumulative Relative Frequency
-20 to <				0.1
to < 0		0.25	21
0 to <				0.7
to < 20			54
20 to <		0.1
Total	60		-	-

Answer 1

Class	Frequency	Relative Frequency	Cumulative Frequency	Cumulative Relative Frequency
-20 to <	60(0.1)=6	0.6	6	0.1
to < 0	60(0.25)=15	0.25	21	21/60=0.35
0 to <	60(0.35)=21	0.7-0.35=0.35	21+21=42	0.7
to < 20	54-42=12	12/60=0.2	54	0.9
20 to <	60(0.1)=6	0.1	54+6=60	1
Total	60		-	-

Class	Frequency	Relative Frequency	Cumulative Frequency	Cumulative Relative Frequency
-20 to <	6	0.6	6	0.1
to < 0	15	0.25	21	0.35
0 to <	21	0.35	42	0.7
to < 20	12	0.2	54	0.9
20 to <	6	0.1	60	1
Total	60		-	-