Set of cards has a total of 36 cards: 9 numbered cards (1-9) of each color: red, blue, green and yellow. If a card is selected at random, what is the probability that the card is red? If a card is selected at random, what is the probability that it is red, given that the number of the card is 4? Are the events E="the card selected is red" and F="the card selected is a 4" independent? Why?

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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  1. Set of cards has a total of 36 cards: 9 numbered cards (1-9) of each color: red, blue, green and yellow.

    1. If a card is selected at random, what is the probability that the card is red?
    2. If a card is selected at random, what is the probability that it is red, given that the number of the card is 4?
    3. Are the events E="the card selected is red" and F="the card selected is a 4" independent? Why?
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