Question

I chemistry class Andrew has earned scores 64 69 73 on three test. He must maintain an average of 70 to pass the course. What score must Andrew earn on the final to pass the course?

Answer 1

He currently has an test score sum of 206. He needs 280 to pass (the average score, 70, multiplied by four different test scores).

280-206=74.

He needs to get a score of 74 to pass.

Answer 2

Answer:

The score Andrew must earn on the final to pass the course is:

                                74

Step-by-step explanation:

Let the score earned by Andrew in the final to pass the course= x

I chemistry class Andrew has earned scores 64 69 73 on three test.

We know that the average is the ratio of sum of the data points to the number of data points.

Here the average of 4 test scores is the ratio of the sum of scores in the 4 test to the number of test i.e. 4.

It is given that:

He must maintain an average of 70 to pass the course.

i.e.

$\dfrac{64+69+73+x}{4}=70\\\\i.e.\\\\64+69+73+x=70\times 4\\\\206+x=280\\\\x=280-206\\\\x=74$