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A university has 10,000 students of which 55% are male and 45% are female. If a class of 30 students is chosen at random from the university populaton, find the mean of the number of male students.. Find the standard deviation of the number of male students.
How can you tell what are the solutions of a quadratic equation by looking at its graph? Explain.
Income level of the industrial salespeople and their employment status. Be sure to state the critical value, the value of the Chi-square test statistic, and your decision (accept/reject).
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
The distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob?
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. What is the expected value of the average weekly income of all the recent graduates?
Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rates by subway riders are uniformly distr..
Using a random sample of 100 workers, researchers calculate a 95% confidence interval for the average hourly wage earned by construction workers in the city of Boston. This interval they calculate is from $18 to $26.
Which of the following sets of data provides the clearest diffrence between the two samples?
Determine the mean and standard deviation of this distribution?
Standard deviation of 12 years. Worker is stopped at random and asked to fill out questionnaire. Determine the probability that this worker is less than 30 old?
The time needed to drive from town A to town B is normally distributed with a mean of 180 minutes and standard deviation of 20 minutes. What is the probability that a person will drive from town A to town B
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