Question

If the mean of the observation x,2x+1,2x+5,2x+9is30. What is mean of last two observation?

Answer 1

Answer:

Step-by-step explanation:

Mean=sum of observations/no. Of observations

30=((x)+(2x+1)+(2x+5)+(2x+9))/4

120=7x+15

105=7x

x=15

Last two observations are 2x+5 and 2x+9.

2x+5=35 (by putting x=15)

2x+9=39 (by putting x=15)

Mean=sum of observations/no. Of observations

=(35+39)/2

=74/2

=37