The shirt was $7.45 he pays with a $20 how much he getting back
1 answer:
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Answer:
Mean score of 90 students = 77.2
Step-by-step explanation:
Mean score of 50 students from school A = 75
Mean score of 40 students from school B = 80
We need to find mean score of the 90 students?
First we will find sum of scores of students from school A
We know that:
We have Average = 75, Number of terms = 50, We need to find Sum of terms (scores)
So, Sum of scores for School A = 3750
Now, we will find sum of scores of students from school B
We know that:
We have Average = 80, Number of terms = 40, We need to find Sum of terms (scores)
So, Sum of scores for School B = 3200
Now, We will find mean score of the 90 students?
Mean score of 90 students will be:
So, mean score of 90 students = 77.2