trigonometry

Asked by akhileshnarayanan | 12th Mar, 2010, 02:27: PM

Expert Answer:

Class

Class mark

Frequency

Cumulative Frequency

0-10

5

8

8

10-20

15

8

16

20-30

25

14

30

30-40

35

22

52

40-50

45

30

82

50-60

55

8

90

60-70

65

10

100

Mean = (5x8 + 15x8 + 25x14 + 35x22 + 45x30 + 55x8 + 65x10)/100 =  37.2

n/2 = 100/2 = 50, hence median class is 30-40, l = 30, cf = 30, f = 22, h = 10.

Therefore, median = 30 + (50-30)x10/22 = 39.09

Modal class, 40-50. Hence, f0 = 22, f1 = 30, f2 = 8, l = 40, h = 10.

Mode = 40 + ((30-22)/(2x30-22-8))x10 = 42.67.

Regards,

Team,

TopperLearning.

 

Answered by  | 14th Mar, 2010, 08:15: AM

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