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: Add every number in the diagram, including those outside the circles but inside the rectangle (the sample space). Calculate
So, the probability that Alex picked a blue pen is 0.4 or 40%. Secondary Math 2 Module 9 Probability 9.4 Answers
When working with two-way frequency tables, this becomes: [ P(A|B) = \frac\textFrequency of (A and B)\textFrequency of B (total) ] : Add every number in the diagram, including
