Ichemistry 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?

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.

answer: 1, 3 and 5 are correct

step-by-step explanation:

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents