I want it step by step & the p-value how do we get it exactly

Exhibit 9-4 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. 19. Refer to Exhibit 9-4. The test statistic is a. 1.96 b. 1.64 c. 2.00 d. 0.056 ANS: C 20. Refer to Exhibit 9-4. The p-value is between a. .005 to .01 b. .01 to .025 c. .025 to .05 d. .05 to .10 ANS: B 21. Refer to Exhibit 9-4. At 95% confidence, it can be concluded that the mean of the population is a. significantly greater than 3 b. not significantly greater than 3 c. significantly less than 3 d. significantly greater then 3.18 ANS: A