Question

if the arithmetic mean of the two numbers X1 and X2 is 5 if X1 =3,then X2 is​

Answer 1

Answer:

We have,

n

x

1

+x

2

+x

3

+...+x

n

=1

⇒x

1

+x

2

+x

3

+...+x

n

=n (Given)

∴ Required arithmetic mean =

n

k

x

1

+

k

x

2

+

k

x

3

+...+

k

x

n

=

k

1

(

n

x

1

+x

2

+x

3

+...+x

n

)=

k

1

if k<1→

k

1

>1

if k>1→

k

1

<1

if k=2→k=1