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A contractor plans to use four tractors to work on a project in a remote area. The probability of a tractor functioning for a year without a breakdown is known to be 80%.
If X denotes the number of tractors operating at the end of a year, determine the probability mass and distribution functions of X.
The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day. Compute the coefficient of variation.
a major company would like to assess the impact of using a professional trainer to conduct a confidence-building
an economist states that 10 of springfields labor force is unemployed. a random sample of 400 people in the labor
a sample of 148 college students at a large university reports getting an average of 6.85 hours of sleep last night
Describe the sampling distribution of the sample proportion
A typical adult has an average IQ score of 105 with a standard deviation of 20. If 20 randomly selected adults are given an IQ test, what is the probability that the sample mean scores will be between 85 and 125 points?
professor yao wants to know whether students at eku can score higher by attending class each time. he understands that
a. a furniture manufacturer produces sofas. to improve their production process they make a study of the sources of
She randomly samples 67 CFOs and finds that 40 of them get their money news from newspapers. Does the test show enough evidence to reject the findings of Robert Half International? Use a = .05.
Find the critical value having an area of 0.95 to its right for an F-curve with 8 numerator degrees of freedom and 15 denominator degrees of freedom.
with a mean of 2.0 seconds and standard deviation of 0.5please show your worka. px lt 2b. p1.5 lt x lt 2.5c. px gt
When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20?
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