Question

The mean attendance of a school is 780 in first four days of the week . The mean attendance for first 5 days is 840. How many were present on Friday?


Pls reply fast

Answer 1

The answer is "1080"

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

Answer 2

Answer:

1080

Explanation:

740 * 4 = 3120

840 * 5 = 4200

4200-3120 = 1080

Hope it helps !!