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1. Suppose that an event contains 10 observations and event contains 15 observations. If intersection of events and contains exactly three observations, how many observations are in union of these two events?

A. 0                  B. 10                C. 22                D. 28

2. Approximately how much of total area under the normal curve will be in interval spanning two standard deviations on either side of the mean?

A. 50%             B. 68.3%                      C. 95.5%                      D. 99.7%

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