Question

If the arithmetic mean of X,X+3,X+6,X+9andx+12 is 10 then X =

Answer 1

Answer:

4

Step-by-step explanation:

mean= sum of observations ÷no. of observations

10 =x+x+3+x+6+x+6+x+12÷5

10=5x+30÷5

10×5=5x+30

50=5x+30

5x=50-30

5x=20

x=20÷5

x=4