Mathematics, 21.02.2020 03:50 wolffee895
A store gives a customer 20% off if $10 or more amount of product is purchased. Otherwise the customer pays the usual price at checkout. The amount of product a customer purchases is modeled by a continuous random variable X with density
Answers: 3
![\\EP=\int\limits^{10}_{5} {x \frac{50}{x^3}} \, dx +\int\limits^{\infty}_{10} {0.8x \frac{50}{x^3}} \, dx\\\\EP=\int\limits^{10}_{5} {\frac{50}{x^2}} \, dx +\int\limits^{\infty}_{10} {\frac{40}{x^2}} \, dx\\EP=[\frac{50}{-x}]_5^{10} +[\frac{40}{-x}]_{10}^{\infty} \\EP=[\frac{-50}{10}+\frac{50}{5}] +[\frac{-40}{\infty}+\frac{40}{10}]\\\\EP=-5+10+0+4\\EP=9](/tpl/images/0518/7608/be13d.png)
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A store gives a customer 20% off if $10 or more amount of product is purchased. Otherwise the custom...
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