Question: How Do I manually solve the following question? I don't need answers, just some advice, formulas, or something to put me on the right path.

How Do I manually solve the following question?

I don't need answers, just some advice, formulas, or something to put me on the right path.

Thank you

"

    1. A recent survey indicates 40% of the students at a local community college are working while attending school. A random sample of 100 students is selected. (round standard deviation to 2 decimals) What is the probability:
    2. a.Exactly 45 students are working?
    3. b.More than 20 students are working?
    4. c.Less than 30 of the students are working? "

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