We have given,Also,Putting this in above equationNow, given …[1]using thisWe have, …[2]We know,If x1, x2, … , xn are observations with frequencies f1, f2, … , fn i.e. x1 occurs f1 times and x2 occurs f2 times and so on, then mean() of observations is given byFrom [1] and [2]

Q. 344.2( 8 Votes )

If , then =
A. 23

B. 24

C. 27

D. 25

Class 10th RD Sharma - Mathematics 7. Statistics

Answer :

We have given,

Also,

Putting this in above equation

Now, given …[1]

using this

We have,

…[2]

We know,

If x₁, x₂, … , x_n are observations with frequencies f₁, f₂, … , f_n i.e. x₁ occurs f₁ times and x₂ occurs f₂ times and so on, then mean() of observations is given by

From [1] and [2]

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