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an urn contains 8 white balls and 12 red balls. a sample of four balls is selected at random from the urn. what is the probability that the sample contains two white balls and two red ones? a) 0.3814 b) 0.3933 c) 0.0424 d) 0.1028 e) 0.1474 f) none of the above.

Respuesta :

0.3814 is the probability that the sample contains two white balls and two red ones .

What is probability in math?

  • Probability refers to potential. The subject of this area of mathematics is the occurrence of random events.
  • The range of the value is 0 to 1. To forecast how likely events are to occur, probability has been introduced in mathematics.

Total number of balls = 8 + 12 = 20

Total number of elementary cases

           = ( 20 4 )

Total number of favourable cases

           = ( 8 2 ) * ( 12 2 )

Required probability

   = ( 8 2 )  *  ( 12 2 )/( 20  4 )

 = 0.3814

Learn more about probability

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