Question

Find the mean of the following frequency distribution :
Class
0-15
15-30
30-45
45-60
60-75
75-90
90-105

Frequency
8
16
23
57
33
23
13

Answer 1

Answer:

CLASS Fi. Xi. FiXi

0-15. 8. 7.5. 60

15-30. 16 22.5. 360

30-45. 23. 37.5. 862.5

45-60. 57. 52.5. 2,992.5

60-75. 33. 67.5. 2,227.5

75-90. 23. 82.5. 1,897.5

90-105 13. 97.5. 1,267.5

TOTAL. 173. 9,667.5

Sigma f i x i. =9,667.5.

Sigma f i. 173.

MEAN=55.88150289