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Every Normal model is defined by its parameters: the mean and the standard deviation.
Suppose that the mean ?= 20, and that 45% of the area is above 30. What is the standard deviation?
A) 60
B) 70
C) 80
D) 90
1 a sample of 100 flights for united airlines shows that 64 are on time. a sample of 100 flights for american shows
48 or fewer will answer the question correctly. What is the z-score that you should look up in the z-table to find the desired probability?
At a used-book sale, 100 books are adult books and 160 are children's books. Of the adult books, 70 are nonfiction while 60 of the children's books are nonfiction. If a book is selected at random, find the probability that is is:
Two manufacturing facilities produce 1280 × 1024 LED (light-emitting diode) displays. Twelve displays are chosen at random from each lab, and the number of bad pixels is noted for each display.
the operator of a large production plant would like to estimate the mean amount of time a worker takes to assemble a
the average movie admission price for a recent year was 7.18. the population variance was 3.81. a random sample of 15
A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for ..
suppose a machines life time in years can be moldeled with an exponential distribution with rate of lambda 14.a.
The x and the y variable in the table below are correlated. Determine the 'R' value, and then determine the regression equation.
How many treatments are there? What is the total sample size? Is there a significant difference at the 5% Level of significance?
In a class of 40, 16 driver a car made outside the United States. What is the confidence interval for the total population of students at the 95% level?
Find the mean and the standard deviation of the sampling distribution of -x and find the interval containing 95.44% of all possible sample means returns.
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