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IQ scores follow a standard bell curve and have a mean score of 100 and a standard deviation of 15. That means approximately 68% of scores will fall within a range of 85 to 115, and around 95% of scores will fall between 70 and 130. 10 Best free PC cleaners of 2020: 100% Free download Update on October 2, 2020 • Eric Rosenthal. Do you believe your PC has been running slow lately? If yes, you might want to install a good PC optimization software. We collected & tested 10 best free PC cleaners to Speed up your PC.