Thanh has scores of 54, 83, 67, and 73 on his first four math exams. What score must he make on the fifth exam to have an averag

Question

Gekata [30.6K]

3 years ago

7

Thanh has scores of 54, 83, 67, and 73 on his first four math exams. What score must he make on the fifth exam to have an averag

e of 70 or better for the five exams?

Mathematics

1 answer:

miv72 [106K] · Answer 1 · 2022-05-27T00:03:40+03:00

To solve this, you would set up the equation to find the arithmetic mean of the data. This equation is (53+83+67+73+x)/5=70, where x=the score of the fifth exam. First, you combine the constants to get (276+x)/5=70. Then, multiply both sides by 5 to get rid of the denominator, to give you 276+x=350. Then subtract 276 from each side to get x=74. So, Thanh needs to score a 74 on his last exam to get a 70 in the class.