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A piece of electronic equipment is built with 3 cooling fans. The equipment will function only if at least 2 of the 3 pans are working. The lifetimes of the fans are subject to forces of mortality that are independent, constant and identical. The force of mortality is equal to 0.098. Calculate the probability that the electronic equipment will work for at least 5 years.
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is:
an engineer takes a large number of independent measurements of the length of a component and obtains mean x 5.2 mm
1.a researcher is interested in comparing sat scores for students enrolled in public schools private schools and those
A sample of 40 random weeks finds a weekly loss mean of $3200 with a standard deviation of $750. Test their claim at the a=0.05 level.
the u.s. energy information agency reported that the mean monthly household electric bill in the united states in 2007
A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product.
In relative frequency histogram for a large set of GPAs, the mean and the standard deviation are 2.10 and 0.21 respectively. What proportion of GPAs falls within 1.68 and 2.52?
Mean of $32,000 and a standad deviation of $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
A study shows that employees that begin their work day at 9:00 a.m. vary their times of arrival uniformly from 8:40 a.m. to 9:30 a.m. The probability that a randomly chosen employee reports to work between 9:00 and 9:10 is?
a publisher has discovered that the number of words contained in a new manuscript is normally distributed with ? 20000
Based on the results shown in the following table, test at the 0.05 level of significance whether there is a relationship between parents' reaction to the course and the number of children that they have in the school system
If the sales, employment, production, and other business series increase or decrease over a period of time and approximate a straight line, the equation for this growth is given by
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