Weighted averages

Find the class grade for a student with grades: Test 89%, Quiz 92, Homework 86%, and Classwork 95%.
Tests are 60% of the grade, Quiz 15%, Homework is 10% of the grade, and Classwork is 15% of the grade.

• 89.25
• 91.55
• 90.05
• i don't know

Tags

CCSS.6.EE.B.6

Why would you use a weighted average instead of a traditional average calculation?

• Because you have a lot of numbers
• Because the value you are trying to calculate is made up of categories which each have different weights.

Tags

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3

CCSS.HSS.MD.B.5

A student's grade in a Psychology course is comprised of tests (40%), quizzes (20%), papers (20%), and a final project (20%). His scores for each of the categories are 85 (tests), 100 (quizzes), 92 (papers) and 84 (final project). Calculate his overall grade.

• 90.25
• 88.2
• 89.2
• 86.7

Tags

CCSS.5.NBT.B.7

James worked for 12 consecutive days, earning an average wage of $160 per day as a contractor. During the first 6 days, James averaged $140 per day and his average wage for the next 5 days was $175. How much did he earn on the last day?

• $1715

• $205

• $160

• $140

Tags

CCSS.7.EE.B.3

CCSS.7.EE.B.4

CCSS.7.NS.A.3

A new cars salesperson, sold an average of $28,000 per day for the first 5 days she worked. The next 3 days she worked, she sold an average of $42,000. How much did she sell on average per day over the entire 8 days?

• 266,000

• 32,000

• 33,250

• 31,250

Tags

CCSS.7.EE.B.3

At a health club, 80% of the members are men and 20% of the members are women. If the average age of the men is 30 and the average age of the women is 40, what is the average age of all the members?

• 32 years old

• 33 years old

• 32.5 years old

• 34 years old

Tags

CCSS.6.RP.A.3C

First marking period is worth 40%, second marking period is worth 40%, and the final exam is worth 20% of the final semester grade. Heath earned a 94% first marking period and a 91% second marking period. Heath wants to finish the semester with an A (at least a 90%). What does he need to score on the final exam to make this happen?

• 16%

• 50%

• 80%

• 90%

Tags

CCSS.7.NS.A.3

A history professor weights his grades as follows:

Tests 50%

Attendance 25%

Final exam 25%

If Susy earned an average of 91 on her tests, 80 on her attendance and 85 on her final exam, what will her final grade in the class be?

• 85.33

• 85

• 86.75

• 83.75

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.3

CCSS.HSA.SSE.A.1

A chemist needs a 30% iron alloy. How many grams of a 70% iron alloy must be mixed with 16 grams of a 20% iron alloy to obtain the required

30% alloy?

• 28 grams

• 20 grams

• 12 grams

• 4 grams

Tags

CCSS.HSA.CED.A.1