The mean attendence of a school for the first four days of the week was 780 anf for the first five days it was 840.How many students were present on friday?
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Attendence of first 4 days = 780
Attendence of first 5 days = 840
=> 840 - 780 = 60
therefore ; 60 students were present on friday .
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Answer:Explanation:
The formula of average is
average = sum of entities / total no. of entities
Given,
Average of 4 days attendance = sum of students present during first 4 days/ 4
sum of students = average x 4
= 3120
Now, we can find out the students present on Friday as
Average attendance of five students = sum of attendance of five students/ 5
Average of five students = sum of students present during first 4 days + present on friday / 5
Thus, students present on friday = (840 x 5) - sum of students present on first four days (3120) = 1080
Step-by-step explanation:
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