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In gallup's Annual Consumption Habits Poll, telephone interviews were conducted for a

random sample of 1014 adults aged 18 and over. One of the questions was, "How many

cups of coffee, if any, do you drink on an average day?" The following table shows the

results obtained (gallup website, August 6, 2012).

Screen Shot 2019-10-02 at 00.15.16.png

Screen Shot 2019-10-02 at 00.15.16.png
23. In Gallup’ s Annual Consumption Habits Poll, telephone interviews were conducted for a
random sample of 1014 adults aged 18 and over. One of the questions was, “How many
cups of coffee, if any, do you drink on an average day?” The following table shows the
results obtained (Gallup website, August 6, 2012). Number of Cups Number of
per Day Responses 0 365 l 264 2 193 3 91 4 or more 101 Define a random variable x = number of cups of coffee consumed on an average day. Let
x = 4 represent four or more cups. a. 21.0.6 Develop a probability distribution for 1:. Compute the expected value of 3;. Compute the variance of 1:. Suppose we are only interested in adults who drink at least one cup of coffee on an
average day. For this group, let y = the number of cups of coffee consumed on an
average day. Compute the expected value of y and compare it to the expected value of x.

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