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This week we practice with Binomial Distribution.
You can use Appendix Table E or Excel Function Binomdist.

About 30% of adults in United States have college degree.
(probability that person has college degree is p = 0.30).

If N adults are randomly selected, find probabilities that

1) exactly X out of selected N adults have college degree
2) less than X out of selected N adults have college degree
3) greater than X out of selected N adults have college degree

Choose your numbers for N and X (portion of N).

  • stats -

    About 30% of adults in United States have college degree.
    (Probability that person has college degree is p = 0.30).

    If n adults are randomly selected, find probabilities that:

    1) Exactly 24 out of selected 50 adults have college degree
    =BINOMDIST(24,50,.30,FALSE) = .0032

    2) Less than 36 out of selected 75 adults have college degree
    =BINOMDIST(35,75,.03,TRUE) = .9992

    3) Greater than 22 out of selected 62 adults have college degree
    =1-BINOMDIST(23,62,.03,TRUE) = .0893

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