Find delivery time that all deliveries are less
A pizza delivery service delivers to a campus dormitory. Delivery times follow a normal distribution with mean 20 minutes and standard deviation 4 minutes.
Question: Find the delivery time that 20% of all deliveries are less than.
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Delivery times follow a normal distribution with mean 20 minutes and standard deviation 4 minutes. Find the delivery time that 20% of all deliveries are less than.
Three tubes are chosen successively and at random each time and are also tested successively. What is the probability that: The third tube is good if the first two were found to be good?
In a random sample of 70 subjects, the sample mean is found to be The population standard deviation is known to be : (a) Determine the P-value for this test. (b) Is there sufficient evidence to justify the rejection of at the level? Explain.
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Now change the score of X=8 to X=18, and find the new mean and standard deviation. Describe how one extreme score influences the mean and standard deviation.
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