Answer:
looks like C is best guess
Answer:
Step-by-step explanation:
2(20 + 22) = 2(42) = 84 total books
Answer:
1.831
OI JOSUKE
Step-by-step explanation:
Answer:
A: [-8, infinity)
Step-by-step explanation:
range is the y-values
The average score of all the students in both classes is 84.
<h3>How to calculate the average?</h3>
The class with 30 students had an average score of 80 on a test. The total score will be:
= 30 × 80
= 2400
A class with 20 students had an average score of 90 on the same test. The total score will be:
= 20 × 90
= 1800
Total scores = 2400 + 1800 = 4200
Number of students = 20 + 30 = 50
The average score will be:
= Total score / Total students
= 4200 / 50
= 84
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