Question

$\pix + y = 9$
​

Answer 1

Answer:

Let x

1

,x

2

,x

3

,x

4

be four observations.

According to question

4

x

1

+x

2

+x

3

+x

4

=20

⇒x

1

+x

2

+x

3

+x

4

=80

After adding ’c