Question

A 200m race was organised on sports day in a school and time

taken by 50 students in the race was noted using stop watch.

Table below shows the time taken by the students to finish the

race.

Time

(in sec)

0-40 40-80 80-120 120-

160

160-

200

No. of

participants

5 15 18 10 2

Based on the above data, answer the following questions-



(ii) What is the lower limit of the modal class in the given

data?

a) 160 b) 120 c) 80 d) 40

(iii) What is the mean time (in seconds) taken by a student to

finish the race?

a) 95 b) 100.5 c) 90.4 d) 91.2

(iv) What is the upper limit of the median class in the given

data?

a)160 b) 120 c) 80 d) 40 .(v) what is the empirical formula relating the three measures of central tendency?​

Answer 1

A 200m race was organised on sports day in a school and time

taken by 50 students in the race was noted using stop watch.

Table below shows the time taken by the students to finish the

race.

Time

(in sec)

0-40 40-80 80-120 120-

160

160-

200

No. of

participants

5 15 18 10 2

Based on the above data, answer the following questions-

(ii) What is the lower limit of the modal class in the given

data?

a) 160 b) 120 c) 80 d) 40

(iii) What is the mean time (in seconds) taken by a student to

finish the race?

a) 95 b) 100.5 c) 90.4 d) 91.2

(iv) What is the upper limit of the median class in the given

data?

a)160 b) 120 c) 80 d) 40 .(v) what is the empirical formula relating the three measures of central tendency

Answer 2

Answer:

a 160

b 120

c 90.4

d 40

e:3median =mode +2mean