Professor Sanchez has been toaching Principles of Economics for over 75 years. He uses the following scale for grading Grape Miserical Score .Probability a, Convert the above probebling dumpbution to'n cumulative probable divinbution, (Round your answer to ] decimal places.)b. What is the probability of earning at toast n O In Professor Sanchez's course? (Round your answer to 3 decimal places.) What is the probability of pissing Professor Sarcher's course? (found your answer to ] decimal places)