Question

Suppose you are given either a fair dice or an unfair dice (6-sided). You have no basis for considering either dice more likely before you roll it and observe an outcome. For the fair dice, the chance of observing “3” is 1/6. For the unfair dice, the chance of observing “3” is 1/3. After rolling the unknown dice, you observe the outcome to be 3. What is the new probability that the die you rolled is fair

Answer 1

0.83.

Explanation:

Answer 2

Answer: Our required probability is 0.83.

Explanation:

Since we have given that

Number of dices = 2

Number of fair dice = 1

Probability of getting a fair dice P(E₁) =
`(1)/(2)`

Number of unfair dice = 1

Probability of getting a unfair dice P(E₂) =
`(1)/(2)`

Probability of getting a 3 for the fair dice P(A|E₁)=
`(1)/(6)`

Probability of getting a 3 for the unfair dice P(A|E₂) =
`(1)/(3)`

So, we need to find the probability that the die he rolled is fair given that the outcome is 3.

So, we will use "Bayes theorem":

`P(E_1|A)=(P(E_1)P(A|E_1))/(P(E_1)P(A|E_1)+P(E_2)P(A|E_2))\\\\(E_1|A)=(0.5* 0.16)/(0.5* 0.16+0.5* 0.34)\\\\P(E_1|A)=0.83`

Hence, our required probability is 0.83.