The score Andrew must earn on the final to pass the course is:
74
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.
[tex]\dfrac{64+69+73+x}{4}=70\\\\i.e.\\\\64+69+73+x=70\times 4\\\\206+x=280\\\\x=280-206\\\\x=74[/tex]