Question

For what value of x, the mean of the given observations 2x - 5, x +3, 7 - x, 5 - x and x + 9 with frequencies 2,3,4,6 and 1 respectively is 4 ?​

Answer 1

Answer:

Mean of x,x+3,x+5,x+7,x+10=9

Sum of the terms =5x+25

Mean =

5

5x+25

=9

x+5=9

x=4

Last three observations are 9,11,14

Mean =

3

9+11+14

=11

3

1