CASE STUDY QUESTION 14-Class X-Maths

CASE STUDY QUESTION 14-Class X-Maths

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

(a) Estimate the mean time taken by a student to finish the race.
(i) 54 (ii) 63 (iii) 43 (iv) 50

(b) What will be the upper limit of the modal class ?
(i) 20 (ii) 40 (iii) 60 (iv) 80

Sol: (iii) 60

(c) The construction of cumulative frequency table is useful in determining the
(i) Mean (ii) Median
(iii) Mode (iv) All of the above

Sol: (ii) Median

(d) The sum of lower limits of median class and modal class is
(i) 60 (ii) 100 (iii) 80 (iv) 140

(e) How many students finished the race within 1 minute?
(i) 18 (ii) 37 (iii) 31 (iv) 8