Question

would you please help me do this?!​

Answer 1

Answer:

1

Step-by-step explanation:

mean = €xf / €f

18 = [(13×8)+(15×2)+....(20+p)×5p + ....] / [8+2+...5p+..]

18 = [399+(20+p)5p)]/(23+5p)

18(23+5p) = 399 +100p +5p^2

414 + 90p = 399 +100p +5p^2

5p^2+10p - 15 =0

p^2+2p -3=0

p = 1 or -3 but no negatives

hence p = 1