Question

On a certain test, a class of 12 students has an average (arithmetic mean) score of 80. A second class of 18 students has an average score of 85. What is the average score of the combined classes? ( ) A. 82 B. 82.5 C. 83 D. 84 E. 84.5

Name: on a certain test a class of 12 students has an average arithmetic mean score of 80 a second class of 18 students has an average score of 85 what is the average score of the combined classes 33598
Uploaded: 2024-05-13T11:27:44-08:00
Duration: 3 min 5 s
Channel: Adi S
Description: on a certain test a class of 12 students has an average arithmetic mean score of 80 a second class of 18 students has an average score of 85 what is the average score of the combined classes 33598

          On a certain test, a class of 12 students has an average (arithmetic mean) score of 80. A second class of 18 students has an average score of 85. What is the average score of the combined classes? ( ) A. 82 B. 82.5 C. 83 D. 84 E. 84.5

Added by Deborah F.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Adi S

05/13/2024

Step 1

For the first class, the total score is the average score multiplied by the number of students: $80 \times 12 = 960$ For the second class, the total score is the average score multiplied by the number of students: $85 \times 18 = 1530$ Now, we need to find Show more…

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On a certain test, a class of 12 students has an average (arithmetic mean) score of 80. A second class of 18 students has an average score of 85. What is the average score of the combined classes? ( ) A. 82 B. 82.5 C. 83 D. 84 E. 84.5