Find the indicated probability or percentage for the normally distributed variable.At a local college, times for running the mile are approximately normally distributed with a mean of 4.5 minutes, and a standard deviation of 
What is the probability that a randomly selected time will be less than 4 minutes?
A. 0.274
B. 0.953
C. 0.227
D. 0.047
Answer: D
Mathematics
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Replace the Cartesian equation with an equivalent polar equation.x2 + y2 - 4x = 0
A. r sin2? = 4 cos ? B. r = 4 sin ? C. r cos2? = 4 sin ? D. r = 4 cos ?
Mathematics
Use Stokes's Theorem to calculate 
.F = -3x2yi + 3xy2j + z5k; S is the portion of the paraboloid 1 - x2 - y2 = z that lies above the x-y plane
A. 6
B. 6?
C. 1?
D. 
?
Mathematics
Solve the problem.Let A = {x?x is a natural number divisible by 3 and x < 100 }, and let B = {x?x is a natural number divisible by 13 and x < 100 }. Find n(A ? B).
A. 38 B. 2 C. 40 D. 42
Mathematics
Graph the given line.y = -3
A. 
B. 
C. 
D. 
Mathematics