The table shows the number of students who appeared (A) and the number who passed (P) in an annual examination from four schools P, Q, R and S in the years 2014 to 2018.
The difference between the average number of students who passed from school Q in the years 2015 to 2017 and the number of students who passed from school P in 2015 is \(x\). Find the value of \(x\).
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 31
The average of the three passed figures of school Q is their sum divided by 3; it is then compared with one value of school P.
School Q passed: 2015 = 285, 2016 = 288, 2017 = 294
Average \(\displaystyle=\frac{285+288+294}{3}=\frac{867}{3}=289\)
School P passed in 2015 = 320
\(x=320-289=31\)