The average length of time required to complete a college achievement test is approximately normal with a mean of 75 minutes and a standard deviation of 13 minutes. When should the test be terminated (in minutes) if you wish to allow sufficient time for 80% of the students to complete the test? (Round your answer to two decimal places.) Answer:_______________min You may need to use the appropriate appendix table to
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!
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