1.

In 2016, the mean score on the AP Biology exam was 3.10, with a standard deviation of 1.05. The mean score on the AP US History exam was a 2.74, with a standard deviation of 1.42. What is the combined mean and standard deviation for these exams?

-Mean, 5.84; standard deviation, 3.12

-Mean, 0.36; standard deviation, 2.47

-Mean, 2.92; standard deviation, 0.37

-Mean, 2.92; standard deviation, 1.24

-Mean, 5.84; standard deviation, 1.77

2.

Given the probability histogram pictured for a discrete random variable X, what is ?x?

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