The cost of a repair is $500/worker/day plus $2000 for the material. The owner is consdering using one or two workers, one worker over two days or two workers over one day. Calculate the marginal cost of using two workers.

Suppose Harlene makes lollipops in a fairly competitive industry. Lets say she charges for each lollipop about $2. Her fixed cost is $500. Her variable cost is $2,000 for the first 10 tacos, $1500 for the second 10 tacos, and $1000 for each set of 10 tacos after that. What is his AFC if she produces 200 tacos?

A company has 80 employees whose salaries are summarized below.  What is the mean salary?  Round to the nearest dollar. Score Employees $5,001 – 10,000 17 $10,001 – 15,000 12 $15,001 – 20,000 12 $20,001 – 25,000 15 $25,001 – 30,000 24

The table shows a stem-and-leaf diagram for the test scores of students in a Liberal Arts Math course.  How many scores are recorded in this stem and leaf plot? What is the highest score in the plot? How many students earned the highest score?

8 basketball players are to be selected to play in a game.  The players will be selected from a list of 27 players.  If the players are selected randomly, what is the probability that the 8 tallest players will be selected?  Express your answer as a fraction.

Which is better, a score of 92 on a test with a mean of 71 and a standard deviation of 15, or a score of 688 on a test with a mean of 493 and a standard deviation of 150? 

“38% of adults in the United States regularly visit a doctor”. This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. Why is there an error in her conclusion?

Select the correct sampling method for each of the samples described below. A large school district includes 15 high schools.  The district selects 10 teachers from each high school and asks their opinon about a new curriculum.   A retail chain has 1503 locations.  Human Resources randomly selects 25 stores and asks all the employees at each of these stores their opinion about a new company policy.   A bicycle manufacturing facility selects every 65th frame from the assembly line and inspects it to make sure it meets specifications.   All students in a class are assigned a number from 1 – 32.  Five students are randomly selected using a random number generator.

Use the given information to find the minimum sample size required to estimate an unknown population mean μ. Margin of error: $135 Confidence level: 95% σ = $500

Describe the complement of this event:  Of ten adults, at least one of them has high blood pressure.