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Seventy percent of the bicycles sold by a certain store are mountain bikes. Among 100 randomly selected bike purchases, find the probabilities below. (Round all answers to four decimal places.) (a) What is the approximate probability that at most 70 are mountain bikes? (b) What is the approximate probability that between 60 and 70 (inclusive) are mountain bikes? (c) What is the approximate probability that more than 75 are mountain bikes? (d) What is the approximate probability that at most 30 are not mountain bikes?
The underlying data are in file XR10033. Identify and interpret the p-value for the test. Using the 0.025 level of significance, what conclusion will be reached?
What is the mean of this uniform distribution? What is the standard deviation?
The score for people in general on this questionnaire is 75, with a standard deviation of 12. Using the five steps of hypothesis testing and the 5% significance level (alpha).
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
suppose x y and c represent the length width and perimeter of a flat rectangular sheet metal part. note that x is a
Make a graph to display the distribution of doctors per 100,000 people.Write a brief description of the distribution.Are there any outliers?If so, can you explain them.
The world's smallest mammal is the bumblebee bat. Shown to the right are weights(in grams) from a sample of those bats. Use the traditional method and significance level of .05 to test the claim that these bats come from the same population having..
assuming all sex distributions to be equally probable what proportion of families with exactly six children should be
the mass m of a randomly chosen tin of baked beans is such that mn420100. find the 20th percentile the value of the
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
What is the average time a car waits to begin the wash job? What is the average number of cars in the car wash system? What is the average time required to wash a car?
a well-insulated rigid tank of volume 10 ft3 contains carbon dioxide initially at 30 psia and 60 degrees f. the tank is
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