Question: The mean cocaine consumption of a large population of college students is 2.00 milligrams per day. The standard deviation of this population is 0.20 milligrams per day. Assume that the measurements are distributed approximately normally.

1. What percent of the population consumes at least 2.30 mg/day?
2. What percent of the population consumes not more than 1.50 mg/day?
3. What percent of the population consumes between 1.80 and 2.20 mg/day?
4. What percent of the population consumes between 1.40 and 1.90 mg/day?

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