Solve the problem.The life span of a certain insect in days is uniformly distributed over the interval 
What is the standard deviation?
A. 4.33
B. 4.619
C. 10.392
D. 5.774
Answer: B
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Solve the differential equation.cos x 
+ y sin x = sin x cos x
A. y = cos x ln 
+ c cos x
B. y = sin x ln 
+ c sin x
C. y = cos x ln 
+ c cos x
D. y = cot x + c cos x
Find a counterexample to show that the statement is false.If a number is multiplied by itself, the result is greater than 0.
A. The number is 1.
B. The number is 
.
C. The number is 0.1.
D. The number is 0.
What is the square root of 49?
a. 49 b. 14 c. 7 d. 2401 e. 21
A deck of cards contains 52 cards. These cards consist of four suits - hearts, spades, clubs, and diamonds. Each suit contains one of each of the following: 2, 3, 4, 5, 6, 7, 8, 9, 10, jack, queen, king, and ace. Assume that one card is selected at random from a well-shuffled deck of cards.Find the probability that the card is a queen
A. 
B. 
C. 
D. 