Page 266 - ICSE Math 8

10. The bar graphs show the runs conceded by a bowler during his spell of 10
overs. Find his economy rate. 16
Total runs Conceded 12
(Hint: Economy Rate = × 100)
Total Number of Balls Runs per over → 8
4
0
0 Overs → 10
Australia
11. A worm is a line graph which shows the run rate plotted against the 8 India
number of overs bowled in an innings. The dots shows the fall of 7
wickets in a particular over. Find out the maximum and minimum run 6
rates and the number of wickets lost by each team. 5
4
3
2
1
0
0 10 20
THINK SMART

1. If an exclusive class interval of a data is 1.5 –18.5, the inclusive class interval for the same is:
(a) 1.0 – 19.0 (b) 2.0 – 18.0 (c) 0.5 –19.5 (d) 2.0 – 19.0
2. If the range of a data is 250 and the class interval is 50, then find the number classes.

Maths Lab Activity

Objective: To collect data and represent it in a bar graph
Material required: White and coloured sheets of paper, scale, graph paper, pencil, a pair of scissors,
glue stick
Step 1: Ask the blood group of (say 40) student’s of your class. Note the data in a table as shown.

S. No. Name of the student Blood group (A, B, AB, O)
1.

Step 2: Now group these observations in the table given below:

Blood group Tally marks Number of students
A
B

AB
O
Total

Step 3: Draw a bar graph for the table in step 2 on the white sheet. Cut strips of different colours from
the coloured sheets and paste them on the bars.
Observations: (i) The most common blood group in the class is ___________________.
(ii) The least common blood group in the class is ___________________.

254