Assume that random quesses are made for seven multiple choice questions on an SAT test, so that there are N = 7 trials, each with probability of success (correct) given by p = 0.55. Find the indicated probability for the number of correct answers. Find the probability that the nmber x of correct answers is fewer than 4. P(X<4) =
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!
Assume that random quesses are made for seven multiple choice questions on an SAT test, so that there are N = 7 trials, each with
P(X<4) =
A survey showed that 72% of adults need correction (eyeglasses, contacts, surgery etc) for their eyesight. If 21 adults are randomly selected , find the probability that at least 20 of them need correction for their eyesight. Is 20 significantly high number of adults requiring eyesight correction?
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