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Binomial Distributions
Let X be a random variable following a Binomial distribution. All Binomial distributions have two parameters: number of trials and success probability. For X, n = 11 and p = 0.45. An example of where such a distribution may arise is the following:
You have a bag of candy made by Statistics, Inc. The company makes only two flavors: sour apple and anchovie. In its processing plant, 45% of the candy made is sour apple. Your bag holds 11 pieces. Define the random variable X as the number of sour apple pieces of candy in your bag.
For those who like pictures, here is a graphic of the probability mass function. Note that the distribution is slightly skewed right:
Continuing the candy example, let us determine the probability that there is no more than one piece of sour apple candy in the bag. In symbols, calculate P[X ≤ 1].
In the box below, please enter the value of P[X ≤ 1], where X ~ Binom(n=11, p=0.45), then click on the “Check your answer!” button. Please round your answer to the ten-thousandths place.
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