3.10 In a sample of 12,000 workers, 600 of them werephysically assaulted on the

Question

3.10 In a sample of 12,000 workers, 600 of them werephysically assaulted on the job in the past year. Use thisinformation to estimate the probability that a randomly selectedworker will be physically assaulted on the job during theyear. 3.22(c) Suppose: P(A)-.4, P(B)= .7 and P(A andB)=.3. What is P(A or B)? 3.10 In a sample of 12,000 workers, 600 of them werephysically assaulted on the job in the past year. Use thisinformation to estimate the probability that a randomly selectedworker will be physically assaulted on the job during theyear. 3.22(c) Suppose: P(A)-.4, P(B)= .7 and P(A andB)=.3. What is P(A or B)?

Explanation / Answer

3.10: P=600/12000=0.05=5% 3.22: try to think it this way in A = 0.4 in B = 0.7 in AandB = 0.3 what is the part in A but not in B? 0.4-0.3=0.1 what is the part in B but not in A? 0.7-0.3=0.4 (just for knowledge, what is the part not in A, not in B, and ofcourse not in Aand B? 1-0.3-0.4-0.1=0.2) so not we are looking for P(A or B) P(A or B) means P(A but not B or B but not A)=0.1+0.4=0.5 use a venn diagram may help u too.

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