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Can you help? I need step-by-step directions. I am really slow.

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Can you help? I need step-by-step directions. I am really slow…
Students in the psychology department consume an average of 5 cups of coffee per day with a standard deviation of 1.75 cups. The number of cups of coffee consumed is normally distributed.
• What proportion of students consume an amount equal to or less than 6 cups a day?
• How many cups would an individual at the 80th percentile drink?

Thank you.

 
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