During final exams of the senior year, a Precalculus exam was given to 120 students and the scores approximated a normal distribution. If the mean score was 72 and the standard deviation was 7, what percent of the scores were between 65 and 86. Hint: Draw and label a normal curve and use the percentages of the standard deviations. Write your answer using only numbers and do not include units.
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
During final exams of the senior year, a Precalculus exam was given to 120 students and the scores approximated a
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