26265 population ( even though calculation results in a fraction higher than 0.5 over this number, since the number represents people, you can not round it up to a whole person).
Solution: Treat this like a simple example of a compounded interest, where , like the interest earned on first year earns extra interest on it for next year; the increase in population at the end of a year, contributes to the growth rate, thus 2.5% compounded poverty two years, for 25,000/- people, results in 26,265.
if the mean is 70 minutes, then 90 minutes is 2 standard deviations above 70. if you look at the bell curve i drew, the percent of exams that took over 90 minutes is 2.5%
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