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Suppose that the average weekly earnings for employees in general automotive repair shops is $450, and that the standard deviation for the weekly earnings for such employees is $50. A sample of 100 such employees is selected at random. Find the standard deviation of the sampling distribution of the means of average weekly earnings for samples of size 100.
Find the slope and the line through the points (2,8) and (7,3). Find the slope and the y-intercept of the line 9x + 3y =81. On Friday, Shawn drove to the lake in 45 minutes. On Sunday he returned up in 9 less minutes and averaged 12 more miles per h..
the first plan has an initial fee of $55 and costs an additional .40 per mile driven.the second plan has no initial fee but costs .90 per mile driven. How many miles would we need to drive for the two plans to cost the same?
When solving rational equations, you must check your solutions to make sure you are not including extraneous solutions that are not actual solutions to the original equations.
A cable that weighs 6 lb/ft is used to lift 850 lb of coal up a mine shaft 300 ft deep. Find the work done.
in 2006 75.9 of first-year college students responding to a national survey said they used the internet for research or
State the null hypothesis and the alternative hypothesis that we would use for this test.
The magnitude and direction of vectors u and v are given. Find vector w's polar coordinates.
How is doing operations of adding, subtracting, multiplying, and dividing with rational expressions similar or different from doing operations with fractions? Can understanding how to work with one kind of problem help understand how to work anoth..
Assume 450,000 people line up on the streets to see the Macy's Thanksgiving Parade in 2010. If attendance is expected to increase 30%, what will be the number of people lined up on the street to see the 2011 parade?
Explain Probability of birthdays. Are your best friends' birthdays dependent or independent events?
The function f is graphed below on the interval [0,10].Give the number of valuesc between 0 and 10 which satisfy the conclusion of the mean value theorem for f.
which situation describes a correlation that is not a casual relationship?
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