QR- 2.4 Weighted Averages

Mary read six books in January, four books in February, and eight books in March. What was the average number of books read each month? (a)  

Tags

CCSS.7.EE.B.3

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

• 91.25

Tags

CCSS.6.NS.B.3

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.

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

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

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.6.SP.B.5C

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

James worked for 12 consecutive days, during the first 6 days, James averaged $140 per day, his average wage for the next 5 days was $175, and for the last day he earned $205. How much did he earn on average each day?

(a)  

Tags

CCSS.7.NS.A.3

Identify the population in the situation below.

A factory overseer selects 40 threaded rods at random from those produced that week at the factory, then the overseer tests their tensile strength.

• 40 threaded rods produced at the factory for the week

• All the threaded rods produced at the factory for the week

• Each rods tensile strength.

• All the threaded rods produced by every factory for the week

• threaded rods

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Identify the sample in the situation below.

A factory overseer selects 40 threaded rods at random from those produced that week at the factory, then the overseer tests their tensile strength.

• 40 threaded rods produced at the factory for the week

• All the threaded rods produced at the factory for the week

• Each rods tensile strength.

• 40 threaded rods produced by every factory for the week

• threaded rods

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1