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The amount of gas (in thousands of gallons) Speedway on Seminole Trail sells on a typical...

The amount of gas (in thousands of gallons) Speedway on Seminole Trail sells on a typical

Tuesday is a continuous random variable with probability density function

f(x)=3(x−4)^2, 4≤x≤5.

How much gas can Speedway expect to sell each Tuesday? What are the variance and standard deviation?

Math   Statistics-And-Probability   
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