Question

1. mr. plums math class of 25 students had an average of 84 on a test. miss scarlets class of 17 students had an average of 92 on the same test. what is the average of the two classes combined? (hint: the answer is not 88)

Explanation:

Step1: Calculate the total score of Mr. Plum's class

The total score of Mr. Plum's class of 25 students with an average of 84 is $25\times84 = 2100$.

Step2: Calculate the total score of Miss Scarlet's class

The total score of Miss Scarlet's class of 17 students with an average of 92 is $17\times92=1564$.

Step3: Calculate the total number of students

The total number of students in the two - classes combined is $25 + 17=42$.

Step4: Calculate the total score of the two classes combined

The total score of the two classes combined is $2100 + 1564 = 3664$.

Step5: Calculate the average of the two classes combined

The average of the two classes combined is $\frac{3664}{42}\approx87.24$.

Answer:

Approximately 87.24