Final answer:
To find the probability of event B, subtract the probability of event A from the probability of event A or B. Therefore, the probability of event B is 0.2726.
Step-by-step explanation:
To find the probability of event B, subtract the probability of event A from the probability of event A or B. Therefore, the probability of event B is 0.2726. To find the probability of event B, we can use the formula P(B) = P(A or B) - P(A). In this case, we are given that P(A) = 0.6 and P(A or B) = 0.8726. Substituting these values into the formula, we have P(B) = 0.8726 - 0.6 = 0.2726. Therefore, the probability of event B is 0.2726.