just I need part B

G9 A B D E F G H 1 K L M N o P Q R s T 1 2 Answer (a) given data std dev 25 sec 3 4 a) Customers calling into a call center had a mean wait time of 100 seconds with a 5 standard deviation of 25 seconds in 2019 (normally distributed). If customers are unwilling to 6 hold for a customer service agent beyond 2 minutes, what fraction of customers does the 7 call center lose in 2019? What is the sigma capability of this process? (5 points) max allowed wait time 2 minutes mean wait time 100 sec 0.8 8 p(2) z-value (120-100)/25 NORMSDIST(0.8) = 0.788 1-p(z)= 1-0.788= 0.212 9 10 11 b) Observing this poor performance, the manager enlists a consulting company to 12 train its employees. Following this training, in 2020, the manager collects data from 13 a sample of 25 calls and finds the average wait time in these 25 calls to be 95 14 seconds. Can the manager say, with 95% confidence, that the training has 15 improved call center performance? What if the sample size had been 100 instead 16 of 25? (10 points) 17 18 19 20 21 22 23 24 Activate Windows 25