<prompt> 68 values are covered in how many Standard Detions SD?1 SD2 SD3 SD4 SD  <response>: Normal Gaussian curve:- Is bilaterally symmetrical, bell - shaped. Mean, Median and Mode coincide. Mean Median Mode Has mean u 0 and SD s 1. 1 Mean - 1SD u - 1s covers 68 values. 2 Mean - 2SD u - 2s covers 95 values. 3 Mean - 3SD u - 2s covers 99 values. 