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A fast food outlet has an average of 8 cars at the drivethrough during "lunch rush" 11am-1pm. On average, 2 cars per min. arrive at the resaurant parking lot, and consider the drivethrough but 25% of the time, an arriving car does not actually enter the drive-through line (i.e. it "balks"). Assume no car enters the line without completing the drive-through service (i.e. there is no "reneging").
a.) On average, how much time does a car spend at the drive-through?
b.) The current average processing time at the drive through is 3 min. The manager wants to reduce this processing time to 2 min. If the arrival rate, the probability of "balking" and the time in the drive through line remain the same, how many cars would be at the drive-through on average, with the new processing time?
What is the 95% confidence interval for the true mean length of the bolt? Assume a normal population distribution.
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.
A surgical technique is performed on seven patients. You are told there is a 70% chance of success. Find the probability that the surgery is successful for at least four patients.
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.06
a population has a standard deviation of 50. a random sample of 100 items from this population is selected. the sample
As a sample size approaches infinity, how does the student's t distribution compare to the normal z distribution? When a researcher draws a sample from a normal distribution, what can one conclude about the sample distribution? Explain.
Your firm has a contract to make 2000 staff uniforms for a fast -food retailer. The heights of the staff are normally distributed with a mean of 70 inches and a standard deviation of 3 inches. What percentage of uniforms will have to fit staff sho..
for a small sample difference of means test where n1 20 and n2 20 and we can assume the population variances are
A consumer magazine randomly selected 100 new hybrid car dealers from across the country, and created a list of retail prices. They want to know if the price differs from $25,000.
The best estimator or appreciative of the population proportion is 0.45. How large must the sample be?
Find the probability that in a given month a) there are exactly 9 days with 0.01 inch or more precipitation, b) there are at most 9 days.
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