Mean and variance of the total cost
The total cost for a production process is equal to $1,000 plus 2 times the number of units produced. The man and variance for the number of units produced are 500 and 900 respectively. Find the mean and variance of the total cost.
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Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal places.)
A busy restaurant determined that between 6:30 P.M. and 9:30 P.M. on Friday nights, the time between arrivals of customers follows an exponential distribution with an average of 0.41 minutes.
The associated standard deviations (in $1,000) are 10, 12, and 9. Assuming the profits are independent, what is the probability the consultant will make less than $145,000 from the three projects?
A charitable organization solicits donations by telephone. Employees are paid $60 a week plus 20% of the money their calls generate. Assume the amount of money generated by an employee follows a normal distribution with a mean of $700 and a standa
The Foundation Corporation specializes in constructing the concrete foundations for new houses in the South. The company knows that because of soil types, moisture conditions, variable construction, and other factors, eventually most foundations w
If the airline must return the $300 price plus a penalty of $400 to each passenger that cannot get on the flight, what is the expected payout (penalty plus ticket refund) that the airline will pay?
Make a 90% two-sided confidence interval for the mean aluminum content of such specimens over the 52-hour study period. Make a 95% two-sided confidence interval for the mean aluminum content of such specimens over the 52-hour study period. How does
Estimate the mean change in oxygen consumption during feeding dives compared with nonfeeding dives. What is the 99% confidence interval for the population mean change? Test the hypothesis that feeding does not change the metabolic costs of a dive.
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