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1000 rolls of a fair die are made. Find the (approximate) probability that 6 appears between 150 and 200 times. If 6 appears exactly 200 times what is the probabilty that 5 will appear less than 150 times?
The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the mea..
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
What is the probability of correctly guess the right code on the first try? What is the probability of not correctly guessing the right code o the first try?
Test the claim by random sampling 60 hgh school boys. Researcher found 54 boys have a cell phone at a = 0.01. Should the claim be rejected?
It is important for airlines to know the approximate total weight of the baggage carried on each airplane. An airline researcher believes that the mean baggage for each adult is 60 kg. To test his belief, he draws a random sample of 50 adult passenge..
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
A cola dispensing machine is set to depense 9 ounces per cup with a standard deviation of .5 oz .THe manufacturer would like to set the control limits so that for samples of 16,
a random sample of size 10 is chosen from a population of 100 without replacement if a and b are two indiviuals among
If an employee is selected for promotion, find the probability that the employee will be under 25 or a female. Express your answer as a fraction in lowest terms.
An orange juice producer buys all their oranges from one particular orchard. The amount of juice from the oranges is approximately normally distributed with a mean of 152 ml. and a standard deviation of 41 ml.
What does a confidence interval tell us and why is it importance to use a confidence interval?
a large manufacturing firm tests job applicants who recently graduated from college. the test scores are normally
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