II. Identify the mean, variance, and standard deviation of the following tables then compute for the percentage of what is being asked. REMINDER! Round up only your final answers and Z- scores. Note: Z- scores are rounded up to 2 decimal places. 4. These are the grades of randomly selected graduating students. 61-65 2 66-70 3 71-75 11 76-80 12 81-85 18 86-90 27 91-95 16 96-100 11 a. What is the probability of a randomly selected student have a grade of at least 84 percent? b. What is the probability that a randomly selected student's grade is between 90 and 100 percent?

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