Question

The mean of x an d 1/x is 5
then the mean of x² and 1/x² is ​

Answer 1

Answer:

Given the mean of x and

x

1

is M

Then M=

2

x+

x

1

=M

⇒2M=x+

x

1

square both these sides

∴(x+

x

1

)

2

=(2M)

2

⇒x

2

+2(

x

1

)

2

=4M

2

⇒x

2

+(

x

1

)

2

=4M

2

−2

Then mean of x

2

and

x

1

2

2

x

2

+

x

2

1

=4M

2

+2⇒x

2

+

x

1

2

=2M

2

+1

Answer 2

Answer:

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