Answer
$88.8$
Work Step by Step
$\frac{20}{100} \times (96+85+91） + \frac{40}{100} \times 86
= 88.8$
We add up the scores of the first three tests and weigh that by 20%, then weigh the score of the final test by 40% to attain our answer.
Elementary Statistics: Picturing the World (6th Edition)
by Larson, Ron; Farber, Betsy
Published by
Pearson
ISBN 10:
0321911210
ISBN 13:
978-0-32191-121-6
Chapter 2 - Descriptive Statistics - Section 2.1 Frequency Distributions and Their Graphs - Exercises - Page 49: 18
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