The average weekly earnings of a chef is $940 with a standard deviation of $40. Assume that we select a random sample of 64 chefs. Compute the standard error of the mean $______ What is the probability that the sample mean will be greater than $955? (Four decimal places.) _______ If the population of chefs consisted of 300 drivers, what would be the standard error (in dollars) of the mean? (Three 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!
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