Question: 1 Find the probability that either event A or B occurs if the chance of A occurring is 0.5 , the chance of B occurring

1 Find the probability that either event A or B occurs if the chance of A occurring is 0.5 , the chance of B occurring is 0.3 and events A and B are in depend.

2.For a sample of size 8, the critical values of chi-square for a 99% confidence interval for the population variance are

3.The manager of Ardmore Pharmacy knows that 25% of the customers entering the store buy prescription drugs, 65 % buy over the counter drugs and 18% buy both types of drugs. What is the probability that a randomly selected customer will buy at least one of these two types?

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