One indicator of an outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. (a) If a data set has mean 70 and standard deviation 5, is 80 a suspect outlier? O No, since 80 is more than 2.5 standard deviations above the mean. O Yes, since 80 is more than 2.5 standard deviations above the mean. O No, since 80 is less than 2.5 standard deviations above the mean. Yes, since 80 is less than 2.5 standard deviations above the mean