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The mean weight of luggage check by a randomly selected tourist-class passenger flying between two cities on a certain airline is 40 lb, and the standard deviation is 10 lb. The mean and standard deviation for a business-class passenger are 30 lb, and 6 lb, respectively. If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
At the .05 significance level, can we conclude that the guideline is still reasonable?
What is the likelihood that none of the selected flights arrived within fifteen minutes of scheduled time?
Must the company replace old truck? If so which of new trunks must they use? Describe in detail.
Compute the correlation among the variables. Describe perfect correlation also negative correlation. Utilize the following data to answer questions related.
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
The probability of the patient being chosen at random as having meningitis as only site of infection is?
Find the mean and standard deviation for the population and population of exam scores
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
Use simple exponential smoothing with α = 0.3 to forecast battery sales for February through May. Assume that the forecast for January was for 22 batteries.
Assume that you are conducting a survey of customer satisfaction regarding their cellular phone.
A small New England college has a total of 400 students.The Math SAT is required for admission, and the mean score of all 400 students is 620. The population standard deviation is found to be 60. The formula for a 95% confidence interval yields th..
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