Find the mean and standard deviation of the specified probability density function.f(x) = 0.3e-0.3x for [0, ?)
A. ? = 33.33, ? = 33.33
B. ? = 3.33, ? = 3.50
C. ? = 3.75, ? = 3.75
D. ? = 3.33, ? = 3.33
Answer: D
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Solve.Mary borrowed 
to finish college at an interest rate of 
per year. How much interest will Mary need to pay next year?
A. $630 B. $6300 C. $14,630 D. $20,300
Solve the problem.A textile company has specific dyeing and drying times for its different cloths. A roll of Cloth A requires 65 minutes of dyeing time and 50 minutes of drying time. A roll of Cloth B requires 70 minutes of dyeing time and 25 minutes of drying time. The production division allocates 2420 minutes of dyeing time and 1400 minutes of drying time for the week. How many rolls of each cloth can be dyed and dried?
A. 7 rolls of Cloth A, 30 rolls of Cloth B B. 18 rolls of Cloth A, 32 rolls of Cloth B C. 5 rolls of Cloth A, 42 rolls of Cloth B D. 20 rolls of Cloth A, 16 rolls of Cloth B
State a sample space S with equally likely outcomes for the given experiment.A box contains 13 white cards numbered 1 through 13. List the sample space of the event choosing one card with a number greater than 6.
A. S = {7, 8, 9, 10, 11, 12, 13} B. S = {1, 2, 3, ... 13} C. S = {11} D. S = {6, 7, 8, 9, 10, 11, 12, 13}
Determine which value(s), if any, must be excluded from the domain of the variable in the expression.
A. x = -7 B. x = 7 C. x = 0 D. none