3.9A Standard Deviation Activity Teacher Ratings (1 means "very poor," and 9 means "best instructor I've ever had") Class Class I Class II Class III 1. Estimate which distribution has the largest standard deviation? 2. Estimate which distribution has the smallest standard deviation ? 3. SDI = Mean 1 = 4. SD II = Mean il = 5. SD III = Mean Ill - Formula for Standard Deviation: =STDEVP(first cell: last cell) Formula for the Mean: =AVERAGE (first cell: last cell ) Note: Spreadsheet formulas always start with an equal sign. 6. Use the mean and the standard deviation to compare the teacher ratings for the three classes. Use complete sentences