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The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months.
a. What is the probability that a randomly selected terminal will last more than 5 years?b. What percentage of terminals will last between 5 and 6 years?c. What percentage of terminals will last less than 4 years?d. What percentage of terminals will last between 2.5 and 4.5 years?e. If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
Let the following linear programming problem: Determine the optimal solution to this problem. Convert this problem standard LP form.
Let = the sample mean of the 100 scores from University X, and = the sample mean of the 100 scores from University Y. What is the probability that will x be greater than y?
A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer.
Heights Of 10-year old boys, Weve established that heights of 10-year old boys vary according to Normal distribution with =138 centimeters and = 7 centimeters. What proportion is between 150 and 140 centimeters
standard deviation of the heights of young men is about 2.8 inches. suppose (unknown to you) the mean height of all male students is 70 inches. you measure 25 students. what is the sampling distribution of their average height x bar?
When selecting 3 different side dishes from the 16 available choices. What was the incorrect number stated by Joe Montana in the ad?
At a certain college, there were 700 science majors, 100 engineering majors, and 500 business majors. If one student was selected at random, the probability that they are an engineering major is?
In Colorado Springs the newspaper runs mug shots of wanted criminals. The 17% of those published are arrested through information provided to the police. If 200 are published, find the probability that less than 30 are arrested.
What is sampling with replacement, and why it is used?
In terms of measures of association, how is Lambda different from the other measures used for nominal level data?
Normal distribution with mean 32.6 ounces and standard deviation 0.4 ounce. If two packages are randomly selected, what is the probability that the average weight is less than 32 ounces?
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