Solve the problem.A continuous random variable X has PDF f(x) = 
x2(5 - x), 
Find the variance of the random variable X.
A. 
B. 
C. 2
D. 1
Answer: D
Mathematics
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Multiply using the Egyptian algorithm.6 × 54
A. 344 B. 324 C. 298 D. 128
Mathematics
Find the standard form of the equation of a circle that satisfies the given conditions.Center (0, 6); radius 8
A. (x - 6)2 + y2 = 64 B. x2 + (y + 6)2 = 8 C. (x + 6)2 + y2 = 64 D. x2 + (y - 6)2 = 64
Mathematics
Fill in the blank with one of the words or phrases listed below.
A 
is one way to picture and count outcomes.
A. pictograph B. tree diagram C. circle D. histogram
Mathematics
The polar coordinates of a point are given. Find the rectangular coordinates of the point.(7.1, 4.5) Round the rectangular coordinates to two decimal places.
A. (-1.50, -6.94) B. (7.08, -0.56) C. (-1.50, 6.94) D. (7.08, 0.56)
Mathematics