For the given probability density function, over the given interval, find the mean, the variance, and the standard deviation.f(x) = 
, [6, 13]
A. ? = 3.45; ?2 = 4.080; ? = 2.02
B. ? = 3.50; ?2 = 4.080; ? = 2.02
C. ? = 9.50; ?2 = 2.993; ? = 1.73
D. ? = 9.50; ?2 = 4.083; ? = 2.02
Answer: D
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The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
At what time was the temperature its lowest?
A. 4 p.m. B. 9 a.m. C. 6 p.m. D. 1 p.m.
Subtract.(-6x2 + 4x4 + 4 - 9x3) - (1 - 6x3 + 7x4 - 2x2)
A. 11x4 - 15x3 - 8x2 + 5 B. 11x4 - 15x3 - 8x2 + 3 C. -3x4 - 3x3 - 4x2 + 3 D. -3x4 - 15x3 - 8x2 + 5
Solve the problem.A merchant has coffee worth $30 a pound that she wishes to mix with 30 pounds of coffee worth $80 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?
A. 60 pounds B. 75 pounds C. 150 pounds D. 120 pounds
Round to the given value. $2.467
cent
A. $2.47 B. $2.5 C. $2.46 D. $2