Verified Answer :

Billymkhoi

What you need to do is that you plug p=3 into the expression [(5.4p+5)+(8+3.2p)]/2 and you have:
[(5.43+5)+(8+3.23)]/2
= (21.2+ 17.6)/2
= 38.8/2
= 19.4

The average of the two boys' points is p=3 is 19.4 points~

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