In 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. f)  Find ?(? > 20). g)  Find ?(15 ≤ X ≤ 25). h)  Find ?(15 < X < 25). Using cdf.

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