Select all that are true about the bell curve, standard deviation and the empirical rule. 1. 99.7% is 4 standard deviation from the mean 2.if i was going below the mean i would subtract the standard deviation 3. the emperor rule is used in bell curve ( idk if my teacher spelled this wrong but ya) 4. 95% is 2 standard deviations away from the mean 5. the middle of the bell curve is the mean. i only know that the last one is true so pl !