Angle of refraction of a beam of light
Question: What is the angle of refraction of a beam of light that enters the surface of a lake at an angle of incidence of 50°?
a) 15° b) 23° c) 35° d) 63°
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When an opinion poll calls residential telephone numbers at random, only 23% of the calls reach a live person. You watch the random dialing machine make 18 calls.
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A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked, u (mu), of all payroll departmen
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