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 per Day |
Number of Responses |
0 | 365 |
1 | 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.
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