kileynicolee kileynicolee
  • 02-11-2018
  • Mathematics
contestada

Suppose a bag of marbles has 4 green, 2 red, 5 yellow, 1 brown, and 7 blue marbles. What is the probability of picking a red marble?

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Аноним Аноним
  • 02-11-2018

Assuming that each marble can be picked with equal probability, we notice that there is a total of

[tex] 4+2+5+1+7 = 19 [/tex]

marbles, of which 2 are red.

So, the probability of picking a red marble is

[tex] \dfrac{2}{19} [/tex]

In fact, as in any other case of (finite) equidistribution, we used the formula

[tex] P(\text{event}) = \dfrac{\text{number of favourable cases}}{\text{number of all possible cases}} [/tex]

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