1. When A and B are mutually exclusive, P(A or B) can be found by adding P(A) and P(B). True or False 2. It is possible to compute a negative variance or standard deviation. True or False 3. It is possible to compute a negative mean or median. True or False 4. If a batch of data were perfectly symmetrical, the distance from Q1 to the median would always equal the distance from Q3 to the median in an Interquartile Range plot. True or False 5. The 25th percentile is also known as the first quartile. True or False 6. The variance is the square root of the standard deviation. True or False Solution 1. true because P(A and B) = 0 2. false because of sum of squares 3. true 4. true 5. true 6. true.