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A post office has a single line for customers waiting for the next available postal clerk. There are two postal clerks who work at the same rate. The arrival rate of customers follows a Poisson distribution, while the service time follows an exponential distribution. The average arrival rate is three per minute and the average service rate is two per minute for each of the two clerks. What proportion of time are both clerks idle?
0.643
0.250
0.750
0.143
Use α =.01 and test for a significant difference. What is your conclusion?
At 0.05 level of significance, is there evidence that proportion of claims processed under this new system is higher than article reported for previous system?
Of the 500 students who responded to a survey about recycling on campus, 350 said they recycle on a regular basis. The sample proportion is ??
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities.
Solve linear program graphically
Pproportion who are sent to prison after pleading innocent and being found guilty? No, as the test value -1.96 is inside interval (-2.58, 2.58), No, as the test value -4.94 is outside interval (-1.96, 1.96).
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
The largest value in a set of data is 160, and the smallest value is 70. If the resulting frequency distribution is to have six classes of equal width, what will be the class interval?
Multiple choice question based on multiple regression - The coefficient of determination for this model is
A car rental company has determined that the probability a car will need service work in any given month is 0.2. The company has 900 cars.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
Suppose a marketing research firm sends questionnaires to 10 different companies. Assuming that each company, independently of the others, returns its completed questionnaire with probability 0.40, what is the probability that 5 or less questionna..
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