An electrical appliance made by Company A has an average life of 2500 hours, with a standard deviation of 500 hours. Another Company, B, makes this appliance with an average life of 2300 hours, and a standard deviation of 800 hours. We take 300 Company A devices and 200 Company B devices. Calculate the probability that the average life of the sample from Company A isn't 100 hours more than the average life of the sample from Company B 0.4876 0.5382 0.0582 0.9418
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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