gexa * () 9 . Quir 3 (Week 9) - 21F --Rese _ x 3) Question 9 - 9 - Quiz 3 (Week 9) X + theducation.com/ext/map/index.html?_con=conicexternal_browser=0launchUrl=http: %253A9%252F%252FIms.mheducation.com%252Fmghmiddleware%25. Week 9) 0 Saved Help Save & The average grade in a statistics course has been 77 with a standard deviation of 11.5. If a random sample of 57 is selected from this population, what is the probability that the average grade is more than 81? Use Appendix BI for the z-values. (Round your a-value to 2 decimal places and the final answer to 4 decimal places.) Probability