statistics
Among coffee drinkers, men drink a mean of 2.8 cups per day with a standard deviation of 0.5 cups. Assume the number of drinking per day follows a normal distribution.
What proportion drink 3 cups per day or more?
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Answers
The proportion of people who drink 3 cups of coffee per day or more is 0.047, which is about 4.7%. This is calculated using the z-score formula: (x-mean)/standard deviation. In this case, the z-score is (3-2.8)/0.5 = 0.4. This is then used to find the area to the right of the normal distribution curve. Using a z-table, the value of the area to the right of the z-score is 0.047 which is approximately 4.7%.
