n a big university with over 10,000 students, 20% of all students work full time. A random sample of 100 students is selected from the university. Let X denote the number of students who work full time in the sample.  b)  Find ?(? = 20) c)  Find ?(? ≤ 20) d)  Find ?(? ≥ 20)   Can you explain how you got them using work?

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