1 pointTwo fair dice are rolled simultaneously. Let ๐Y represent the sum of the numbers appearing on the upper faces of the dice. Determine the moment-generating function (MGF) of ๐โ๐ธ[๐]YโE[Y]. Select all correct options from below.๐โ3.5๐กโ 16(๐๐ก+๐2๐ก+๐3๐ก+๐4๐ก+๐5๐ก+๐6๐ก)e โ3.5t โ 61โ (e t +e 2t +e 3t +e 4t +e 5t +e 6t )16(๐๐ก+๐2๐ก+๐3๐ก+๐4๐ก+๐5๐ก+๐6๐ก)61โ (e t +e 2t +e 3t +e 4t +e 5t +e 6t )[๐โ3.5๐กโ 16(๐๐ก+๐2๐ก+๐3๐ก+๐4๐ก+๐5๐ก+๐6๐ก)]2[e โ3.5t โ 61โ (e t +e 2t +e 3t +e 4t +e 5t +e 6t )] 2 ๐โ7๐กโ 136(๐โ5๐ก+2๐โ4๐ก+3๐โ3๐ก+4๐โ2๐ก+5๐โ๐ก+6+5๐๐ก+4๐2๐ก+3๐3๐ก+2๐4๐ก+๐5๐ก)e โ7t โ 361โ (e โ5t +2e โ4t +3e โ3t +4e โ2t +5e โt +6+5e t +4e 2t +3e 3t +2e 4t +e 5t )
Question
1 pointTwo fair dice are rolled simultaneously. Let ๐Y represent the sum of the numbers appearing on the upper faces of the dice. Determine the moment-generating function (MGF) of ๐โ๐ธ[๐]YโE[Y]. Select all correct options from below.๐โ3.5๐กโ 16(๐๐ก+๐2๐ก+๐3๐ก+๐4๐ก+๐5๐ก+๐6๐ก)e โ3.5t โ 61โ (e t +e 2t +e 3t +e 4t +e 5t +e 6t )16(๐๐ก+๐2๐ก+๐3๐ก+๐4๐ก+๐5๐ก+๐6๐ก)61โ (e t +e 2t +e 3t +e 4t +e 5t +e 6t )[๐โ3.5๐กโ 16(๐๐ก+๐2๐ก+๐3๐ก+๐4๐ก+๐5๐ก+๐6๐ก)]2[e โ3.5t โ 61โ (e t +e 2t +e 3t +e 4t +e 5t +e 6t )] 2 ๐โ7๐กโ 136(๐โ5๐ก+2๐โ4๐ก+3๐โ3๐ก+4๐โ2๐ก+5๐โ๐ก+6+5๐๐ก+4๐2๐ก+3๐3๐ก+2๐4๐ก+๐5๐ก)e โ7t โ 361โ (e โ5t +2e โ4t +3e โ3t +4e โ2t +5e โt +6+5e t +4e 2t +3e 3t +2e 4t +e 5t )
Solution
The moment-generating function (MGF) of a random variable is a function that generates the moments of the distribution. The MGF of a random variable Y is given by M(t) = E[e^(tY)].
In this case, Y is the sum of the numbers appearing on the upper faces of two fair dice, and we are asked to find the MGF of Y - E[Y].
First, we need to find the expected value E[Y]. Since each die has 6 faces, each with equal probability of 1/6, the expected value E[Y] of the sum of two dice is E[Y] = 2 * (1/6 * (1 + 2 + 3 + 4 + 5 + 6)) = 7.
So, we are asked to find the MGF of Y - 7.
The MGF of Y - 7 is given by M(t) = E[e^(t(Y - 7))].
This simplifies to M(t) = e^(-7t) * E[e^(tY)].
The MGF of the sum of two dice Y is given by E[e^(tY)] = (1/36) * ฮฃ e^(tx), where the sum is over all possible values of x (the sum of two dice), x = 2, 3, ..., 12.
So, the MGF of Y - 7 is M(t) = e^(-7t) * (1/36) * (e^(2t) + e^(3t) + 2e^(4t) + 2e^(5t) + 3e^(6t) + 3e^(7t) + 4e^(8t) + 4e^(9t) + 3e^(10t) + 3e^(11t) + 2e^(12t) + 2e^(13t) + e^(14t) + e^(15t)).
So, the correct option is ๐โ7๐กโ 136(๐โ5๐ก+2๐โ4๐ก+3๐โ3๐ก+4๐โ2๐ก+5๐โ๐ก+6+5๐๐ก+4๐2๐ก+3๐3๐ก+2๐4๐ก+๐5๐ก).
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