<prompt> 95 of confidence limit exist between -- 1. S.D.-2 S.D.-3 S.D- 4 S.D.  <response>: Ans. is b i.e., - 2 SD 1 SD -- Coveres 68 of area 68 confidence limit 2 SD --4 Coveres 95 of area 95 confidence limit 3 SD -- Coveres 99.7 of area 99.7 confidence limit 