Block resting on a frictionless horizontal ledge
A 4 kg block resting on a frictionless horizontal ledge is joined to a string which passes over a pulley and is joined to a hanging 2 kg block. The pulley is a uniform disk of radius 10.0 cm and having mass 0.70 kg.
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The heights of students is distributed with mean of 70 inches and standard deviation of 2.8in. 25 students are chosen, find out the probability that the height of them will average above 72.
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