' D E Sldeby-Side People tend to be more generous after receiving good news. SOLVE' We have a random sample of n = 20 customers Are they less generous after receiving bad news? The and were told to assume tips have a Normal distribution. average tip left by adult Americans is 19%. Say that a server gives 20 patrons of a restaurant a. message on their bill warning them that tomorrow's weather will be had and record the percentage tip they leave. The tips as a percentage of the total bill are given in _ k x = '27: the table. 18.0191 [91183184190185 16.116.818.21 141.017.0116 175200202183 18.023.219.11 Find i Give your answer to two decimal places. Find the 2 statistic. Give your answer to two decimal places. Suppose that percentage tips are Normal with a = 1.8