Prepare a bar diagram, Mathematics

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Question

Write a short note on the following:

1 The weekly salaries of a group of employees are given in the following table. Find the mean and standard deviation of the salaries

Salaries (in Rupees)

75

80

85

90

95

100

No. of persons

3

7

18

12

6

4

2 Find the standard deviation of profit of 100 companies-

Profit in crores

8-10

10-12

12-14

14-16

16-18

18-20

Number of companies

16

24

40

60

40

20

3 Prepare a bar diagram for the following data: India's foreign debt as on 1.4.1980

Source of borrowing

U. S. A

U. S. S. R

U. K.

Japan

Federal Republic of Germany

Amounts of loan (in crores of Rs.)

1,800

1,200

800

600

500

4 Derive the coordinates of the point P, which divides A(x1, y1) and B(x2, y2) internally in the ratio m: n


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