The fuel consumption, in miles per gallon, of all cars of a particular model has a population mean of 25 mpg and population standard deviation of 2 mpg. The population distribution can be assumed to be normal. Find the probability that a car, chosen at random, will have a fuel consumption of less than 24 mpg. Sketch the graph, label the area corresponding to the probability, write the probability in symbolic form before finding the probability (round to 4 decimal places)
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!
The fuel consumption, in miles per gallon, of all cars of a particular model has a population mean of 25 mpg and population standard deviation of 2 mpg. The population distribution can be assumed to be normal.
- Find the
probability that a car, chosen at random, will have a fuel consumption of less than 24 mpg.
Sketch the graph, label the area corresponding to the probability, write the probability in symbolic form before finding the probability (round to 4 decimal places)
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