The Chairman of a Statistics Department in a Certain College $\pi$

The chairman of a statistics department in a certain college believes that 70% of the department's graduate assistantships are given to international students.A random sample of 50 graduate assistants is taken.Assume that the chairman is correct and that $\pi$
= 0.70.What is the probability that the sample proportion p will be between 0.65 and 0.73?

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