Question

IT
100m Race
A stopwatch was used to find the time that it took a group of students to run 100m
0-20
Time ini sec
No ol students
80-100
6
17
4
1.
How many students took part in the race?
a) 8
b) 10
c) 20
d) 30
2.
The construction of cumulative frequcray table is useful to determine,
a) Mean
b) Median
c) Mode
d) all of the above​

Answer 1

Given : A stopwatch was used to  find the time that it took a  group of students to run 100  m.

Time  (in sec)  0-20 20-40 40-60 60-80 80-100

No. of  students   8     10      13          6            3

To Find :  How many students took part in the race?

a) 8

b) 10

c) 20

d) 30

The construction of cumulative frequcray table is useful to determine,

a) Mean

b) Median

c) Mode

d) all of the above​

Solution:

Time  (in sec)    f               cf

0-20                6                 6

20-40              17                23

40-60              4                27

60-80               1                28

80-100             2                30

30  students took part in the race

option d is correct

The construction of cumulative frequency table is useful in determining the Median

option b is correct

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