T is Exponential (7).
Find E ( X ), Var ( X ), and SD( X ) for the given random variable.
0.142857, 0.020408, 0.142857
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Solve.An oil tank holds 280 gallons of oil. On March 1st, the gauge showed it to be 
full. At the end of the month, the tank was 
full. How much oil was used in March?
Fill in the blank(s) with the appropriate word(s).
Solve the system of equations using matrices (row operations). If the system has no solution, say that it is inconsistent.
A. x = 7, y = - 
; 
B. inconsistent
C. x = 
, y = - 
; 
D. x = 1, y = - 
; 
Write the partial fraction decomposition of the rational expression.
A. 
+ 
B. 
+ 
+ 
C. 
+ 
+ 
D. 
+ 
+ 
Solve the problem.100 employees of a company are asked how they get to work and whether they work full time or part time. The figure below shows the results. If one of the 100 employees is randomly selected, find the probability of getting someone who carpools or someone who works full time.
1. Public transportation: 8 full time, 6 part time2. Bicycle: 4 full time, 3 part time3. Drive alone: 30 full time, 29 part time4. Carpool: 10 full time, 10 part time
A. 0.72 B. 0.54 C. 0.3 D. 0.62