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A bag contains 9 red marbles, 4 blue marbles, and 7 yellow marbles. You randomly select three marbles from the bag. a. What is the probability that all three marbles are red when you replace each marble before selecting the next marble? Round your answer to the nearest tenth. about % b. What is the probability that all three marbles are red when you do not replace each marble before selecting the next marble? Round your answer to the nearest tenth. about %

Respuesta :

Answer:

a. 9.1%

b. 7.4%

Step-by-step explanation:

i don't know how to do part c

The probability for the given questions would be as follows:

A]. Probability [tex]= 10.25[/tex]% ;

B] Probability [tex]= 7.37[/tex]%

What is probability?

Probability It is the likelihood of an event calculated by

[tex]=[/tex] [tex]Favourable Outcomes/total Outcomes[/tex]

Probability (A red marble is selected) [tex]= Red Marbles/total Marbles[/tex]

[tex]= 9/20[/tex]

Probability (All 3 marbles are red, with replacement):

[tex]9/20[/tex] × [tex]9/20[/tex] × [tex]9/20[/tex]  [tex]= 0.1025 = 10.25[/tex]%

Probability (3 marbles are red, without replacement):

[tex]9/20[/tex] × [tex]8/19[/tex] × [tex]7/17[/tex] [tex]= 0.0737[/tex] [tex]= 7.37[/tex]%

To learn more about "probability" here:

brainly.com/question/8069952

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