Question

1. The weekly wages (in) of 20 workers of factory is given below:
3000, 2500, 2750, 2250, 3500, 2500, 3000, 2750, 2500, 1500, 1750, 2750, 3750, 2000, 2500,3506
3750, 3000, 2500, 3000
(a) Make a frequency table.
(b) Find the range of the weekly wages
(c) Find the number of workers getting salary more than 2500 but less than 3750.
(d) How many of them are getting maximum wages?
shown in the following table:​

Answer 1

Answer:

We write the given data in cumulative frequency table.

Class Interval

Frequency (f

i

)

Class mark (x

i

)

Cumulative frequency

f

i

x

i

50-55

5

52.5

5

262.5

55-60

20

57.5

25

1150

60-65

10

62.5

35

625

65-70

10

67.5

45

675

70-75

9

72.5

54

652.5

75-80

6

77.5

60

465

80-85

12

82.5

72

990

85-90

8

87.5

80

700

Total

Σf

i

=80

Σf

i

x

i

=5520

Modal class is the class with the highest frequency.

Here the modal class is 55−60.