The schools switchboard has two operators . Anne and Billie . Anne answers calls for middle school students andBillie answers calls for senior school students . Anne fails to answer 3% of her calls and Billie fails to answer 5% of her calls . On a typical school day , Anne and Billie receive 30 and 50 calls respectively during the morning. a Find the average number of calls Anne and Billie fail to answer in total each morning b Find the probability that , between them Anne and Billie fail to answer 2 or more calls