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A forestry researcher wants to estimate the average height of trees in a forest near Atlanta, Georgia. She takes a random sample of 23 trees from this forest. From this sample she found that the average height was 4.5 meters with a standard deviation of 0.4 meters. Assume that the distribution of the heights of these trees are not strongly skewed and do not have any outliers.
She estimates that the revenue from the game will be $80,000 if it does not rain and $55,000 if it does rain. What must the chance of rain be if she is ambivalent about this insurance?
a 25 ft by 35 ft rectangular swimming pool is surrounded by a walkway of uniform width. If the total area of the walkway is 544 ft^2, how wise is the walkway?
Using excel I'm trying to create a probability tree showing all marginal, conditional and joint probabilities. Im also trying to develop a joint probability table and determine the probability that an employee selected at random would fail the man..
A set of data whose histogram is bell shaped yields a sample mean and standard deviation of 50 and 4, respectively. Approximately what proportion of observations are.
in a left-skewed distribution, where is the median in regard to the mean? Is it to the left of the mean or to the right of the mean?
An electrician charges a fee of $60 plus $45 per hour. Let C(x) be the cost in dollars of using the electrician for x hours. Find the linear cost function.
What systems of equations can be solved by graphing or using substitution or elimination? Which method do you like best and why would it be different method. How would you answer this question?
The derivative of a continuous function at x is the slope of the tangent line to the curve at x. The attached pdf file develops the idea of a derivative first using slopes of secant lines and then introducing and explaining the difference quotient..
Assuming the lifetime of the batteries is normally distributed; determine the number of days that at least 95% of the batteries will last beyond.
Find the largest possible total area of the four pens.
If the store purchases a product at a wholesale cost of $1.65, and it is sold at $2.20, what is the gross profit percentage?
Suppose a corporation wants a large picture to hang in its lobby in a space that is 90 ft.². What should be the dimensions of this picture if it is in the shape of a Golden Rectangle?
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