Compared to coffee, cocoa contains about __________ caffeine. Question 11 options: 5% 10% 15% 35% 50%
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A 1.0 ounce piece of chocolate contains 15 $\mathrm{mg}$ of caffeine, and a 6.0 ounce cup of regular contee contains 105 $\mathrm{mg}$ of caffeine. How much chocolate would you have to consume to get as much caffeine as you would from 2.0 cups of coffee?
A $1.0$ ounce piece of chocolate contains $15 \mathrm{mg}$ of caffeine, and $a$ $6.0$ ounce cup of regular coffee contains $105 \mathrm{mg}$ of caffeine. How much chocolate would you have to consume to get as much caffeine as you would from $2.0$ cups of coffee?
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7. A chain of coffee shops wants to standardize the amount of caffeine in an 8 oz. cup of the light roast coffee they sell, so they hire a lab to measure it. The lab receives 50 samples and determines that they have an average of 180 mg of caffeine per cup, with a standard deviation of 20 mg. A histogram of the sampled values approximately follows the normal curve. Use the normal approximation to fill in the blanks: 
 
 (a) About _________% of the sampled cups of coffee had more than 150 mg of caffeine.
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