Unusual for the mean of a sample
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
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A newspaper finds that the mean number of typographical errors per page is three. Find the probability that:?
The frictional force of the tires on the road is 9500 N. If the skid marks show that the bumper compressed a maximum distance of 0.8 m, what was the initial velocity of the car?
What value of k makes this a valid probability density function: f(x) = kx^2 for 1 < x < 3. Answer to 4 decimal places. Using your answer to part (i), what is the mean of X? Answer to THREE decimal places.
The container has a mass of 1350 kg and the total distance the container is lifted is 2.5 m. What is the maximum power the crane must provide to the container during lift?
Find the probability mass function of X and also that of Y. Compute E(X) and E(Y ). Compute V ar(X) and V ar(Y ).
Give 95% confidence interval for the true proportions of those carholders who will registere for the offer. If the acceptance rate is oly 2% or less, the campaign wont be worth the expense. give the confidence interval you found, what would you say.
If using the similitude assumption (e.g., keeping Re the same), what is the required length of the wind tunnel model if test speed is 80 m/sec? Is this a good idea?
Suppose that 73% of all politicians and 36% of all lawyers are liars. At a certain gathering, 68% of the attendees are the lawyers and the rest are politicians. An attendee is selected at random and it is discovered that he or she is a liar. What,
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