Questions 3 -7 refer to the (incomplete) grouped frequency distribution below which depicts the daily training time (in minutes) for 30 athletes.
Training Time (minutes) 0<30
Number of athletes(f)
Midpoint (m)
im
fm2
5 7
15 45 75
75 315 825
1125 14175 61875
30<60 06>09
11
90<120
4
105
420
44100
120<150
3 30
135
405
54675
S
A
B
QUESTION 3
(4 Marks)
The values of Aand B,respectively,are
A. 2040 and 175950 B.2040 and 4161600 C. 2400 and 17595
D. 2020 and 17595
QUESTION 4
QUESTION5
The estimated mean (in minutes) is
The median (in minutes) is:
A. 62 B.65 C.68 D.71
A.68.9 B.68.6 C.67.8 D.68.2
QUESTION 6
QUESTION 7
The mode(in minutes) is
The variance (in minutes)2 is closest to:
A. 70.9 B. 70.2 C.69.6 D. 71.3
A.1266 B.1284 C. 1297 D.1379