<prompt> All are true about normal response curve except:Bell shapedTotal area of curvelSD 0Mean, mode, median coincide  <response>: Ans: C SD0 Ref: Textbook of Preventive and Social Mediciner K Park,21st edition feb 2011.page no:788.Explanation:The standard normal curve : smooth,bell shaped.perfectly symmetrical curve based on infinitely large number of observations.Total area of curvelMean0SD1Mean, median and mode all coincides. 