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Welcome to the article A box contains 150 black pens and 50 red pens Jose said the sum of the probability that a randomly selected pen will not be. On this page, you will learn the essential and logical steps to better understand the topic being discussed. We hope the information provided helps you gain valuable insights and is easy to follow. Let’s begin the discussion!

A box contains 150 black pens and 50 red pens.

Jose said the sum of the probability that a randomly selected pen will not be black and the probability that the pen will not be red is 1. Explain whether you agree.

Answer :

Answer:

I don't agree because:

the probability = the favorable number of objects(in this case red pens)/the number of all objects(in this case the number of all pens) => the probability of picking a red pen = 50(the number f red pens)/150 + 50(the number of all pens) => p = 50/200, we can simplify by 10 so > 5/20, and we can simplify again by 5 so > 1/10.

1 : 10 = 0.1 and 0.1 * 100 = 10% (probability)

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Rewritten by : Brahmana

Answer:

(red pen) = 50/150 = 1/4

prob(not red) = 3/4

prob(black pen) = 150/200) = 3/4

prob(not black) = 1/4

their sum = 3/4 + 1/4 = 1