Use a table to answer the question. Round to the nearest percent.A population is normally distributed. What percentage of the population lies to the left of the population z score -1.55?
A. 8%
B. 4%
C. 6%
D. 9%
Answer: C
Mathematics
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Simplify.(-5xy)3
A. -15xy B. -125x3y3 C. -15x3y3 D. -125xy
Mathematics
Find the exact value without using a calculator. cot ?
A. 1 B. undefined C. -1 D. 0
Mathematics
Provide an appropriate response.The probability distribution for the random variable X is: 
What is the expected value of X?
A. 0.62 B. 0.26 C. 0.22 D. 0.50
Mathematics
Simplify. Assume that all variables represent nonnegative numbers.
A. 108x
B. 6x
C. 6
D. 3x2 
Mathematics