M119L05-page14 - 49.25 + 0.45 a 90 Multiply both sides by...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
(Lesson 5: Measures of Center; 3-2) 3.14 Note : If we had used 10, 10, 10, 25, and 45 as our weights, then w ± = 100 , and we would have obtained the same function: Course average = w ± x ² w ² = 10 () 75 () + 10 () 80 () + 10 () 100 () + 25 () 95 () + 45 () a () 100 = 4925 + 45 a 100 = 49.25 + 0.45 a Let’s rephrase the question. What scores on the Final will yield a weighted score average of 90 points (not 0.90)? We must solve the inequality:
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 49.25 + 0.45 a 90 Multiply both sides by 100. 4925 + 45 a 9000 45 a 4075 a 90.6 points You need to score at least 90.6 points on the Final. If the grader only grades in integers, then, as a practical matter, we could say that you need at least 91 points....
View Full Document

This note was uploaded on 12/29/2011 for the course MATH 119 taught by Professor Kim during the Fall '09 term at SUNY Stony Brook.

Ask a homework question - tutors are online