ng asked in 科學及數學化學 · 1 decade ago

Probability of draw a ball

10 white 4 yellow 10 black balls

ball is chosen random from the urn, and it is noted that it is not one of the black balls. What is the probility that it is yellow ?

2 Answers

Rating
  • 1 decade ago
    Favorite Answer

    4/10+4

    =4/14

    =2/7

  • 1 decade ago

    Since the ball is known to be NOT black, it can be only white or yellow

    So

    P(yellow) = 4/(10 + 4) = 2/7

    Source(s): Myself
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