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A box contains four 40-W bulbs, five 6-W bulbs and six 70-W bulbs, if three bulbs are selected without replacement randomly. What is the probabilty that three are 70-W bulbs?
Certo has complained that he was misrated on his January mission. Both ratings should be 10's, he claims to the chief, who agrees and recomputes the schedule. Do any changes occur over the schedule set in part (b)? What are the strengths and weakn..
Determine the probability that pregnancy will (a) last more than 300 days; (b) less than 240 days; (c) between 250 and 282 days.
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
The New York City Housing and Vacancy Survey showed a total of 59,324 rent-controlled housing units and 236,263 rent-stabilized units built in 194 or later.
What is the probability that the police will strike and the firefighters will not? What is the probability that the firefighters will strike and the police will not?
Suppose that Total Revenue = 200Q and Total Cost = 80 + 50Q where Q, the quantity sold, is a random variable with expected value 20 and variance 4.
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution.
The fixed monthly cost of operating the production facility is $3000. How many units of part # 2206 have to be sold in a month to break-even?
Before starting the trial, a pilot study is conducted involving 7 participants. Is there a statistically significant difference in blood pressures overtime? Run the test at a 5% level of significance.
There are 20 qualified applicants for 5 trainee positions in a fast-food management program. How many different groups of trainees can be selected?
What is the relationship between the value for degrees of freedom and the shape of the t distribution? What happens to the critical value of t for a particular alpha level of df increases in value?
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