Algebra: Standard Deviation

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(a) What is the probability of obtaining tails and a four?

(b) What is the probability of obtaining tails or a four?

(c) What is the probability of obtaining heads and a two?

Mar 16th, 2015

Do these possibly refer to flipping a coin and rolling a dice? (Be sure to include the full question when posting here).

If that's the care, we have:

a) P( tails AND 4 ) = P(tails) x P(4) 

= 1/2 x 1/6

= 1/12


b) P( tails OR 4 ) = 1 - P(not tails AND not 4)

= 1 - P(heads) x P(not 4)

= 1 - 1/2 x 5/6

= 7/12


c) P( tails AND 2 ) = P(tails) x P(2) 

= 1/2 x 1/6

= 1/12

Mar 16th, 2015

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Mar 16th, 2015
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