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Answer:
The mean score for all students on the quiz was 86.
Step-by-step explanation:
This question is solved by a weighed average.
To find the weighed average, we add the values multiplied by their weight, and after that we divide by the sum of weights.
In this problem, we have that:
Mr. Spears had 20 students in his class with a mean score of 80.
So 80 has a weight of 20.
Mrs. Guyton's class of 30 students had a mean score of 90.
So 90 has a weight of 30.
Overall, what was the mean score for all students on the quiz
[tex]M = \frac{80*20 + 90*30}{20 + 30} = 86[/tex]
The mean score for all students on the quiz was 86.
The mean score for all students on the quiz is 86.
Given that,
- Mr. Spears had 20 students in his class with a mean score of 80.
- Mrs. Guyton's class of 30 students had a mean score of 90.
Based on the above information, the calculation is as follows:
[tex]= ((20 \times 80) + (30 \times 90)) \div (20 + 30)\\\\= (1,600 + 2,700) \div (50)\\\\= 4.300 \div 50[/tex]
= 86
Learn more; brainly.com/question/17429689
