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