The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: the speed of a car is 85 km in the first hour and 45 km in the second hour . what is the average speed of the car ?
[EX A]: 65 kmph

[EX Q]: Problem: if each side of a square is increased by 20 % , find the percentage change in its area ?
[EX A]: 44 %

[EX Q]: Problem: for a certain exam , a score of 58 was 2 standard deviations below mean and a score of 98 was 3 standard deviations above mean . what was the standard deviation for the exam ?
[EX A]:
8