<prompt> A study generated a normal distribution with a mean value as 200 and standard deviation of 20. 68 of area will fall between180-220160-240190-210150-250  <response>: Normal curve De Moivrre and Gauss Bell shaped, bilaterally symmetrical infinitely large number of observations Area of the curve is 1 Mean median and mode all coincide which is 0 Standard deviation and variance- 1 Mean - I SD 68 area Mean - 2 SD 95 area Mean - 3 SD 99 area 