Total area under the curve
A frequency curve is based upon a total of 400 cases, 40 of which fall below score of 78. If the total area under the curve is 50 square inches, how much area falls below score of 78?
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A biconvex lens consists of a focal length of 12cm. A 4cm tall candle is positioned 18cm in front of the lens. Determine the characteristics of the image. Employ the diagram and the lens equation.
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Cars arriving for gasoline at the Shell station follow Poisson distribution with mean of 10 per hour. Calculate the probability that in the next 3 hours, more than 25 cars will arrive.
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