A certain pharmacy sells facemask by the box. Since the pandemic, the demand for these facemasks can be modeled using a normal curve and the average number of boxes sold on a typical day is 140 boxes with a standard deviation of 24 boxes. If the pharmacy has 190 facemask boxes on hand today, what is the probability that they have an adequate stock for the day?
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!
A certain pharmacy sells facemask by the box. Since the pandemic, the demand for these facemasks can be modeled using a normal curve and the average number of boxes sold on a typical day is 140 boxes with a standard deviation of 24 boxes. If the pharmacy has 190 facemask boxes on hand today, what is the probability that they have an adequate stock for the day?
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