Question

Jaya's attendance for first two semesters
out of four was 60% and 70%, respectively,
What is the minimum attendance required
in third semester so that her average
attendance will be 80% throughout four
semesters? (Assume equal number of days
among the four semesters)​

Answer 1

Given :

Jaya's attendance for first two semesters out of four was 60% and 70%, respectively.

To Find :

Percentage of attendance in third & fourth semester to get an average of 80% overall

Solution :

•let the attendance required in third & fourth semester is x %

•Average = sum of all observation/ Total Number of observation

•Average = ( 60 + 70+ x + x )/4

80 = ( 60 + 70+ x + x )/4

320 = 130 + 2x

2x = 320-130

2x = 190

x = 95

•Hence , There should be 95% attendance in both third & fourth semester so, as to maintain an average of 80% in four semesters

Answer 2

Answer:

the minimum attendence required us 90

Step-by-step explanation:

Average=60+70+3rd+4th

4

80 = 130 + 3rd+4th

4

320= 140 + 3rd + 4th

3rd + 4th = 190

since the question ask for the minimum attendence... let 3rd semester be 95% then the fourth semester will also be 95%.

Again, lets make the third semester be 90%, the the fourth semester will be 100%..

therefore 90% is the minimum requirement for the THIRD SEMESTER...

Hope it helps.. thankyou