A certain model of automobile has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 22 mpg and a standard deviation of 4 mpg. Find the probability that a car selected at random has gas mileage less than 21 mpg. Round your answer to four decimal places.
?
A. 0.4013
B. 0.9013
C. 0.0987
D. 0.5987
E. 0.1974
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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Provide an appropriate response.The area of a rectangle where length = 37 and width = 39 m is:
A. 783 m2 B. 323 m2 C. 1,443 m2 D. 63 m2
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Solve the problem.The demand equation for a certain product is P = 75 - 0.001x, where x is the number of units sold per week and P is the price in dollars at which one is sold. The weekly revenue R is given by 
What number of units sold produces a weekly revenue of $60,000?
A. 792 units B. 809 units C. 59,925,000 units D. 74,191 units
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Show by substitution whether the number r is a solution of the corresponding quadratic equation.x2 - 4x + 3 = 0; r = -1
A. Yes B. No
Mathematics