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Suppose that 152 out of a random sample of 200 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 99% confidence interval for the proportion of all letters mailed in the United States that were delivered the day after they were mailed.
For each year, create a bar chart and a pie chart.
Findout the percentage of trainees earns less than $900 a month utilizing normal distribution.What percentage of trainees earns less than $900 a month?
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated?
Find the probability that 70 randomly selected washing machines will have a mean replacement time less than 9.1 years.
A social psychologist has developed a test measure gregariousness. The test is normed so that it has a mean of 70 and a standard deviation of 20, and the gregariousness scores are normally distributed in the population of college students used to ..
Determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
The dean of the Western College of Business must plan the school's course offerings for the fall semester. Students demands make it necessary to offer at least 30 undergraduate and 20 graduate courses in the term. Faculty contract also dictate tha..
X is a normally distributed random variable with mean 10 and variance 24. a. Find P(X bigger 14) b. find P(8 smaller X smaller 20)
An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000.
An independent second stage is normally distributed with a mean of 43 minutes and variance of 10 minutes. What is the probability that the two stages take over 80 minutes?
If a garage is robbed, what is the probability the doors were left open?
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
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