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it is estimated that 3.5% of the general population will live past their 90th birthday. In a graduating class of 753 high school seniors, what is the probability that 15 or more will live beyond their 90th birthday?
For two samples from what are assumed to be normally distributed populations, the sample size and standard deviations are n1 = 10, s1 = 23.5, n2 =9 and s2=10.4.
The Martin Company is in the process of planning for new production facilities and developing a more efficient distribution system design. At present, it has one plant at St.Louis with a capacity of 30000 units.
The mean height of women in a country (age 20-29) is 64.3 inches. A random sample of 75 women in this age group is selected. what is the probablity that the mean height for the sample is greater than 65 inches?
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
Find out point estimate and 95% confidence interval for mean family dental expenses of all employees of company.
A circus clown at the top of a 60-foot platform is playing catch with another clown on the ground. The clown on the platform drops a ball at the same time as the one on the ground tosses a ball upward at 80 ft/sec.
If 30 Samples of 100 items are tested for nonconformity, and 95 of the 3000 items are defective, find the upper and lower control limits for a p chart.
If the mean systolic blood pressure is 130 and the standard deviation is 8, find the upper and lower readings that would qualify people to participate in the study.
How do you verify that the assumption of a normal distribution is correct if you've only the mean and standard deviation?
Show that z and iz have the same modulus. How are the graphs of these two numbers related?
According to a well-known newspaper journal, 58.3% of the 222,900 households in particular county get the Sunday edition of local newspaper. Assume that random samples of 200 households are selected.
The rest have no opinion. " Suppose that a a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
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