Question

If the mean of the observations: x, x + 3, x + 5, x + 7, x + 10 is 9, the find the mean of the last three

observations.​

Answer 1

Answer:

$x + x + 3 + x + 5 + x + 7 + x + 10 \div 5 = 9$

5x+25/5=9

5x+25=45

5x=20

x=4