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The lifetime of an electronic component is known to be normally distributed with a mean of 1000 h and a standard deviation of 80 h.
What is the probability that a component picked at random from the production line will have a lifetime
Between 1120 and 1180 h?
Between 955 and 975 h?
Below 955 h?
Above 975 h?
-Sketch the normal and the standard normal distribution for this problem and shade the area corresponding to part d.
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
A machine is adjusted so that when under control, the amount of sugar filled in a bag is normally distributed with a mean amount of 5 pounds.
Last semester a certain professor gave 13 as out of 285 grades. if grades were assigned randomly what is the probability of an A.
Formulate the hypotheses that can be used to determine whether the sample data support the hypothesis that the mean fuel efficiency rating for midsize cars is greater than the mean fuel efficiency rating for large cars.
The process standard deviation is .15, and the process control is set at plus or minus one standard deviation. Units with weights less than 9.85 or greater than 10.15 ounces will be classified as defects. Round your answer to four decimal places.
Do motivation levels between Japanese and American managers differ? A randomly selected group of each were administered the Sarnoff Survey of Attitudes Toward Life (SSATL), which measures motivation for upward mobility. The SSATL scores are summar..
the shape of the distribution of the time required to get an oil change at a 15-minute oil-change facility is unknown.
a survey found that womens heights are normally distributed with a mean 63.9 in and a standard deviation 2.4 in. a
"Factorial" means that the treatments are formed from more than one factor. What are the factors? What do "double-blind" and "placebo-controlled" mean?
let x follows a binomial distribution with mean equals .55 and standard deviation equals .7228. find n and
The overall average for the samples is 17 ounces. The range is only 0.5 ounce. Determine the upper and lower control-chart limits for averages for the boxes of cereal.
in a study in which k 3 n 21 mean of x1 45.3 mean of x2 16.9 and mean of x3 8.2 you compute the following sums of
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