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christina
christina asked in Education & ReferenceHomework Help · 6 years ago

I have a GEOMETRY QUESTION can someone please help?!?

A cog company produces 20 cogs a day, 4 of which are defective. Find the probability of selecting 4 cogs from the 20 produced where none are defective.

A. 4/4845

B. 364/969

C. 256/625

D. 4/5

btw these answers are fractions that's why I have the slashes /.

4 Answers

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  • MojoMaj
    Lv 6
    6 years ago

    D. P(~4 defective) = 1 - 1/5 = 4/5

    Source(s): http://www.probabilityformula.org/
  • lenpol7
    Lv 7
    6 years ago

    P(4 defective) = 4/20 = 0.2

    PS. This is NOT a geometry question , but a STATISTICAL question.

  • scott8148
    Lv 7
    6 years ago

    there are 20C4 ways of selecting 4 cogs

    there are 16C4 ways of selecting 4 non-defective cogs

    the probability is ___ 16C4 / 20C4 = (16 * 15 * 14 * 13) / (20 * 19 * 18 * 17)

  • ?
    6 years ago

    see my dear,masturbate is just feeling,

    don't scare to ask me,u told me to mail ur rebakah id,,

    that is not giving response,,

    feel free to mail me,,my id is,,gladiecharlie@yahoo.in,,when u gat tiem just ask ur doubt here,ok,,

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