Question

a student obtained 40, 50 and 60 marks in english ,maths and urdu having weights 5,4 ,1 respectively .the mean is​

Answer 1

Answer:

We have

x

1

=60,x

2

=75,x

3

=85,x

4

=95,w

1

=1,w

2

=1,w

3

=1 and w

4

=2

∴

X

w

=

w

1

+w

2

+w

3

+w

4

w

1

x

1

+w

2

x

2

+w

3

x

3

+w

4

x

4

⇒

X

w

=

1+1+1+2

1×60+1×75+1×85+2×95

=

5

410

=82

Answer 2

Answer:

Yeah above answer is correct but seems to be very distance between them. ...