Find the expected value for the random variable x having this probability 
a = 20 b = 21 c = 22d = 23e = 24
A. 22
B. 17.8
C. 17.2
D. 18
Answer: A
Mathematics
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Solve graphically.2x + 1 = 9
A. 8 B. -5 C. -4 D. 4
Mathematics
Use Chebyshev's theorem to solve the problem.In a certain distribution of numbers, the mean is 50 and the standard deviation is 6. What can you say about the fraction of numbers that are less than 38 or more than 62?
A. at least 
B. at most 
C. at most 
D. at least 
Mathematics
Write the decimal number as a percent. 3.1
A. 0.31% B. 310% C. 31% D. 0.0031%
Mathematics
Solve 
.
A. 
B. 
C. 
D. 
E. 
Mathematics