A skewed data set has a mean of 50 and a standard deviation of 10. Which of the following might possibly be true? Group of answer choices More than 89% of the data values are between 20 and 80. No less than 30% of the data values are less than 30 or greater than 70. No more than 50% of the data values are between 30 and 70. At least 15% of the data values are less than 20 or greater than 80