Thread: probability of cancellations

A barbershop requires appointments for perms and hair cuts. Ten percent of those makeing appointments cancel or simply fail to show up. Next week's appointment calendar has 64 appointments. Let x be the number of missed appointments out of the 64. The probability that more than 3 cancellations and/or no shows will occur during the next week is?

Originally Posted by jax760

A barbershop requires appointments for perms and hair cuts. Ten percent of those makeing appointments cancel or simply fail to show up. Next week's appointment calendar has 64 appointments. Let x be the number of missed appointments out of the 64. The probability that more than 3 cancellations and/or no shows will occur during the next week is?

Use binomial with n = 64 and p = 0.1 to calculate Pr(X > 3) = 1 - Pr(X = 0) - Pr(X = 1) - Pr(X = 2).