Solve the problem.In statistics, the sampling distribution of the random variable Z = 
is the standard normal distribution, where 
is the sample mean, ? is the population mean, ? is the population standard deviation, and n is the sample size. Simplify this expression.
A. Z = 
B. Z = 
C. Z = ?
(
- ?)
D. Z = 
Answer: A
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Solve the problem.Mike Penn is an employee of Acme Manufacturing Company. He has an 8-hr workday and each day is paid $0.30 for each unit produced or the hourly rate, whichever is greater. His hourly rate is $6.50 per hour. Last week he produced 132 units on Monday, 167 units on Tuesday, 124 units on Wednesday, 136 units on Thursday, and 147 units on Friday. What were his gross earnings for the week?
A. $243.25 B. $260.00 C. $296.50 D. $308.00
Graph the function.f(x) = 3(x - 2)
A. 
B. 
C. 
D. 
Use a graphing calculator to approximate the vertex of the graph of the parabola defined by the following equation.y = -5x2 - 4x + 6
A. (0.4, 6.8) B. (-0.4, 5.2) C. (-0.4, 6.8) D. (2, 6.8)
Solve.Use the given graph of y = x2 - 3x - 10 to solve x2 - 3x - 10 = 0.
A. -5, -2 B. 5, 2 C. -5, 2 D. -2, 5