Determine probability that sample mean breaking strength
The breaking strength of the rivet has mean value of 10,000 psi and standard deviation of 600 psi. Determine the probability that the sample mean breaking strength for a random sample of 36 rivets is between 9,800 and 10,100?
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The fraction X of male runners and the fraction Y of female runners who compete in marathon races are stated by the joint density function f(x,y) = 8xy for 0 ? y ? x ? 1. Find the covariance of X and Y
Each front tire on a hybrid is assumed to be filled to the pressure of 26 psi. Assume the actual air pressure in each tire is the random variable: X for the right tire and Y for left tire with the joint pdf. f(x,y) = k(x2 + y2) for 20 ? x ? 30 and
Civil engineers responsible for the design as well as maintenance of aircraft pavements traditionally use pavement-quality concrete. A study was conducted to access the suitability of concrete blocks as a surface for aircraft pavements.
Costs until shutdown are part of mine's operating costs. Maintenance costs start in twenty years at $200,000 annually. How much should be deposited now if fund will earn 6% interest? Suppose maintenance costs do not change.
An important manufacturing procedure produces cylindrical components for automotive industry. It is significant that the procedure produces parts having mean of 5.0 millimeters.
A CI is desired for the true average stray-load loss ? (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with ? = 3.6. Provide a 95%
Find maximum concentration of medicine attained by dosing and when it occurs? For antibiotic to be effective, its concentration should exceed 100 mg/gal for the minimum of 60 min. Was dosing effective?
On basis of extensive tests, the yield point of specific kind of mild steel-reinforcing bar is known to be normally distributed with ? = 100. The composition of the bar has been slightly modified
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