As ceo of startrooper video unlimited, you wish to install a chain of video arcades in sleepy city, u. s.a. the city council regulations require that the number of arcades be within the range shared by at least 75% of all cities. what is this range? (find the interval containing at least 3/4 of the data as guaranteed by chebyshev's rule. round your answers to one decimal place.)

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]