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christina
christina asked in Science & MathematicsMathematics · 6 years ago

I NEED HELP WITH A PROBABILITY QUESTION CAN SOMEONE PLEASE HELP?!?

You roll a 6-sided die with faces numbered 1 trough 6, and toss a coin. What is the probability of rolling a 3 or getting heads?

A. 2/3

B. 1/2

C. 1/12

D. 1/3

4 Answers

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  • Como
    Lv 7
    6 years ago

    P (3) = 1/6

    P (head) = 1/2

    P (head or 3) = 1/6 + 1/2 - 1/12 = 7/12

  • Ben
    6 years ago

    A. 2/3

  • ?
    Lv 7
    6 years ago

    Well,

    P( both ) = P(rolling a 3) + P(getting Heads) - P(rolling a 3 AND getting Heads)

    = P(rolling a 3) + P(getting Heads) - P(rolling a 3) * P(getting Heads) < events are INDEPENDENT >

    = 1/6 + 1/2 - (1/6)*(1/2)

    = 2/12 + 6/12 - 1/12

    = 8/12

    = 2/3

    therefore :

    A. 2/3 <--- ANSWER

    hope it' ll help !!

  • Prozone
    6 years ago

    Michael you are finding 7/12 not 8/12 btt true answer is 7/12 too , alternative way = 1-5/6.1/2

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