Find the mean and standard deviation of the specified probability density function.f(x) = 
for [6, 13]
A. ? = 9.50, ? = 1.73
B. ? = 3.45, ? = 2.02
C. ? = 9.50, ? = 2.02
D. ? = 3.50, ? = 2.02
Answer: C
You might also like to view...
Solve the problem. Round your answer, if appropriate.As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume that the current image is 7 cm × 5 cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.7 cm/s and the width of the image is changing at 0.1 cm/s.
A. 8.4 cm2/sec B. 4.2 cm2/sec C. 5.4 cm2/sec D. 10.8 cm2/sec
Solve the problem.Beaufort Canal has a semi-elliptical cross section with a width W = 82 feet and a depth D = 11 feet (see figure). The keel on Sasha's yacht rides 4 feet below the water line at the keel's deepest point. If the yacht travels parallel to the canal, and assuming the canal is completely full of water, how close can Sasha bring the yacht's centerline to the edge of the canal without running aground? (The keel is the very bottom of a boat hull and runs directly below the boat's centerline from front to back.) Round your answer to the nearest foot.
A. 3 ft B. 4 ft C. 13 ft D. 28 ft
Solve the equation.
= 5
A. ?
B. {5}
C. {25}
D. 
Solve the problem.The stadium vending company finds that sales of hot dogs average 37,000 hot dogs per game when the hot dogs sell for $2.50 each. For each 50 cent increase in the price, the sales per game drop by 5000 hot dogs. What price per hot dog should the vending company charge to realize the maximum revenue?
A. $3.35 B. $1.20 C. $3.10 D. $3.70