The life of a battery is a random variable with probability density function
, 
where x is the time in months. Calculate E(X).Enter just a reduced fraction of form 
unlabeled.
Fill in the blank(s) with the appropriate word(s).
45/14
Mathematics
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Determine whether or not the graph is a graph of a function of x.
A. Function B. Not a function
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Use ratios or conversion factors to convert the measures of time.Convert 168 hours to days.
A. 56 days B. 84 days C. 7 days D. 49 days
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Find the probability.A lottery game has balls numbered 1 through 21. A randomly selected ball has an even number or a 10.
A. 
B. 
C. 
D. 10
Mathematics
Solve the problem.Write 7 out of 100 students as a reduced fraction and as a percent.
A. 
, 70%
B. 
, 7%
C. 
, 0.7%
D. 
, 70%
Mathematics