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In a lottery, a player pays $1 and selects four distinct numbers from 0 to 9. Then, from an urn containing 10 identical balls numbered from 0 to 9, four balls are drawn at random and without replacement. If the numbers of three or all four of these balls matches the player's numbers, he wins $5 and $10, respectively. Otherwise, he loses. On the average, how much money does the player gain per game? (Gain = win - loss.)
Determine the probability that four or fewer people arrive in a one-minute period.
Write a procedure fringe that takes as argument a tree (represented as a list) and returns a list whose elements are all the leaves of the tree arranged in left-to-right order. For
Supplier B's tires have an average life of 60,000 miles with a standard deviation of 2,000 miles. Which of the following statements is true?
Based on these data, do you think the same people used these two kiln sites? Base your conclusion on a 95% confidence interval for the difference in aluminum oxide content of pottery made at the sites.
Write the contrast for comparing the water quality around the two beaches on the eastern shore with that around the three beaches on the western shore.
Prove d/dt(u(x(t),t))+tanh(x(t))(d/dx(u(x(t),t)))=0 u(x(t),0)=a(x(t)) limit as x tends to infinity of u(x,t)=0 has at most one solution.Explain why there is no boundary condition at x=0 and find a solution for the special case a(x(t))=sinh(x(t))
A realtor wants to know if he can estimate the fair market value of a house using the lot size as a predictor. Below is a sample of his data.
We select a random sample of 25 observations from a normally distributed population with an unknown population variance. The computed test statistic for a right tail, greater than, hypothesis test is t=1.55.
Test at the 2.5% significance level whether the variance of the particle diameters of all particles in 220-rated sandpaper is greater than 2.0 micrometers.
if a asteroids are entering the earths atmosphere and disintegrate with a rate that reduces their size by a factor on
Find a 99% confidence interval for the true proportion of adults with Internet access who watch multiple TV episodes back to back.
Six years? ago, 12.5?% of registered births were to teenage mothers. A sociologist believes that the percentage has increased since then.
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