Solve the problem.The life span of a certain insect in days is uniformly distributed over the interval 
What is the standard deviation?
A. 10.392
B. 4.33
C. 5.774
D. 4.619
Answer: D
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Divide.1.5 ÷ 0.05
A. 3 B. 0.03 C. 30 D. 0.3
Complete the sentence so the result is an identity. Let x be any real number.
= 
A. cos x B. sec x C. csc x D. cot x
Solve the problem using matrices.Jerry has 3 pieces of string. The total length is 110 inches. The sum of the two longer pieces is 90. The middle piece is twice as long as the shortest piece. What are the lengths of the 3 pieces?
A. 10, 20, and 80 inches B. 20, 50, and 60 inches C. 20, 40, and 50 inches D. No solution
Solve the problem.A stone thrown downward with an initial velocity of 39.2 m/sec will travel a distance of s meters, where 
and t is in seconds. If a stone is thrown downward at 39.2 m/sec from a height of 514.5 m, how long will it take the stone to hit the ground? Round your answer to the nearest second.
A. 22 sec B. 8 sec C. 7 sec D. 15 sec