Question

What do i do again? and could someone tell me the answer please. thank you.

Answer 1

Use the formula for arithmetic mean

Explanation:

. Let the unknown be x

42=(39×1)+(40×2)+(41×5)+(42×0)+(43×1)+x/10

Cross multiply

420=367+x

Subtract 367 from both sides

53=x

Therefore

X=53