Question

(Part 1) The table lists the grades for an algebra quiz: 38, 38, 36, 42, 39, 45, 49. What was the mean for the class? (Part 2) The table lists the grades for a quiz in an art class: 80, 81, ?, 83, 80, 84, 82. What was the mean for the art class? What was the missing grade? *The mean grade for the art quiz was twice the mean grade for the Algebra quiz.*

Answer 1

(Part 1) the mean for algebra class is 41.

Just add all the numbers and divide by 7.

(Part 2a) the mean for art class is 82.

Since the mean grade for art is twice as mean grade for algebra, just multiply 41x2=82.

(Part 2b) the missing grade was 84.

I just did guess & check starting from 82 and that’s how I got my answer.

Answer 2

Part 1: 41
Part 2: Missing Grade 84, Mean 82