Determining the percentage of the population
A college requires an IQ of 120 or more for entrance. From what percentage of the population must it draw its students? Mean is 100 and standard deviation is 15
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At a distance of 11 km, a 170 Hz horn, assumed to be a point source, is barely audible. At what distance would it begin to cause pain?
A blower develops 750mm of water gauge at a speed of 1480rpm and a flow rate of 38cubicmeter per sec. Determine the specific speed of air blower?
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If the conductor is 0.30 m long and a constant current of 7.0 mA flows through it, what force does it experience from a magnetic field that varies spatially from B = 17.0 (i.hat) T to B = 5.0 (i.hat) T with a uniform drop from the top to the botto
A ball is released from the bottom of an elevator which is traveling upward with a velocity of 6ft/s. If the ball strikes the bottom of the elevator shaft in 3 s, determine the height of the elevator from the bottom of the shaft of the shaft at th
The specific heat of a substance varies with temperature according to c(T) = A + BT + CT2. Find the energy required to raise the temperature of a mass m of this substance from T1 and T2. (Use any variable or symbol stated above as necessary.)
A physics lab instructor wants to estimate the time required for physic students to complete a required experiment. From a previous study she found the population standard deviation to be 16 min. How large a sample is required to be 90% confident
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