A.IF THE AVERAGE OF FOUR ROUNDS IS 78, THEN THE TOTAL POINTS SCORED...

5. a.If the average of four rounds is 78, then the total points scored is 78 ×4 = 312. If his score were todrop 2 points, that means his new average would be 76. A 76 average for five rounds is a total of 380points. The difference between these two point totals is 380 – 312 = 68. He needs a score of 68 on thefifth round.