Question 3
2 answers:
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Answer:
The mean is given by:
And the standard deviation would be:
And the distribution for X+Y would be:
And the best answer would be:
D.) Mean, 6.7; standard deviation, 2.08
Step-by-step explanation:
Let X the random variable who represent the AP Art History exam we know that the distribution for X is given by:
Let Y the random variable who represent the AP English exam we know that the distribution for X is given by:
We want to find the distribution for X+Y. Assuming independence between the two distributions we have:
The mean is given by:
And the standard deviation would be:
And the distribution for X+Y would be:
And the best answer would be:
D.) Mean, 6.7; standard deviation, 2.08