急Maths....10pts

In a school,5% of the students are members of the Mathematics Club. If a student is chosen at random,what is the probability that the studenr is not a member of the Mathematics Club?

the ans is 19/20(19over20)

LIST OUT ALL THE THINGS AND METHOD!!!

3 個解答

評分
  • 1 十年前
    最愛解答

    let in the school has 100 students

    members of Mathematics Club in the school

    = 100 X 5%

    = 5 students

    not mathematics club member in the school

    = 100 - 5

    = 95 students

    so the probability that the student is not a member of the Mathematics Club

    = 95/100

    = 19/20

  • 1 十年前

    19/20=95%=0.95

    the probability that the studenr is not a member of the Mathematics Club

    not memberis1-5%=95%

    so ans is95%

  • 1 十年前

    設the students is not a member of the Mathematics Club is x%:

          100%-5%=x%

    100/100-5/100=x/100

           95/100=x/100

               95=x

                x=95

    可能錯

                 

    2006-11-22 19:02:14 補充:

    95=95/100=19/20

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