Question

SECTION-II
17/ Case study based - 1
For 150m Race
a stop watch was used to find the time that it took a group of students to run 100m
Time in
0–30
30-60
60-90
90-120
120--150
(Seconds)
No. of
3
6
5
7
4
students
(i) Estimate mean time by a student to finish the race.
1
(a) 78.6
(b) 76.5
(c) 77
(d) 79
(ii) What will be the upper limit of the model class?
1
(a) 60
(b) 120
(c) 90
(d) 70
(iii) The construction of cumulative frequency table is useful in determining:
1
(a) mean
(b) median
(c) mode
(d) None of these
(iv) How many students finished the race within 2 minutes ?
1
(a) 21
(b) 20
(c) 28
(d) 14
Std.:X MATH [3]​

Answer 1

Answer:

a. b. b. a thank you for your point