Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 30

Interpretation From long experience a landlord knows that the probability an apartment in a complex will not be rented is 0.01. There are 20 apartments in the complex, and the rental status of each apartment is independent of the status of others. When a minimum of 16 apartments units are rented, the landlord can meet all monthly expenses. Which probability is more relevant to the landlord in terms of being able to meet expenses: the probability that there are exactly four unrented units or the probability that there are four or fewer unrented units Explain.