Probability question?

I'm taking statistics and need helps solving these problems

If we roll a fair, six-sided die twice,

what at is the probability that the sum is at least 10

what is the chance that the sum is both odd and at least 6

given the sum is odd, what is the chance the sum is at least 6



0|0
1|2

What Guys Said 2

  • Chance that the sum is at least 10 --> This means only a 5 or a 6 may be rolled (two 3s wouldn't be enough for a sum of 10). Per roll, the probability to get a 5 or a 6 is 1/3 or 33.333%. This has to be multiplied by two, since you want to roll the die twice. So the probability that the sum will be at least 10 is 1/6 or roughly 16.5%.

    Now I think you can do the rest on your own.

    0|0
    1|0
    • 2mo

      You do know that 1/3 * 2 is 2/3, right?

    • 2mo

      @JSmuve No, it's not. What you're doing is adding 1/3+1/3. If you multiply it, you'll get 1/6. If you don't believe me, take a calculator and type 0.33x0.33. You'll get something close to 0.165, which is 16.5% or 1/6.

    • 2mo

      No. Go back to elementary school math.
      1/3 + 1/3 = 1/3 * 2 = 2/3
      1/3 * 1/3 = (1/3)^2 = 1/9
      1/3 * 1/2 = 1/6
      Take your own advice and put them into a calculator.

  • I'm horrible at math but I'll take a stab and guess 14.3% for all

    0|0
    1|0

What Girls Said 1

  • 1. 1/6
    2. 1/3
    3. 2/3

    Let me know if you need any work

    4|3
    0|0
    • 2mo

      Thank you so much for helping me but I was just wondering how you got 2/3

    • Show All
    • 2mo

      Thank you so much 😊

Loading...