<prompt> Normal distribution curve is determined by:Standard deviation and meanStandard deviation and modeMode and medianStandard deviation and median  <response>: Ans. a Standard deviation and mean. Ref. Park PSM 22ndpg. 7921. Normal distribution curve Standard normal curve Normal Gaussian curve A smooth symmetrical curve. Total area of the curve is 1; its mean is zero; and its standard deviation is 1. The mean, median and mode all coincide. Limits on either side of mean are called confidence limits.- Area between one standard deviation on either side of the mean x 1 m will include approximately 68 in the distribution.- The area between two SD on either side of the mean x 2 m approximately 95 .- Area between three SD on either side of mean x 3 m approximately 99.7 in the distribution. Percentage of values in a population, which will fall within various ranges within an ideal curve of normal distribution:- Mean - d 68.27- Mean - 1.96d 95.00- Mean - 2d 95.45- Mean-3d 99.732. Poisson distributionLimiting form of binominal distribution when probability of success is closer to zero and numbers of trials are infinite. Meanvariance.3. Skew distribution Skewed to left negatively skewed;Skewed to Right Positively skewed1If more outlying values are smaller than the rest, data are said to be skewed to left;If more outlying values are larger than the rest, data are said to be skewed to left2Data have longer tail among lower values;Data have longer tail among higher values3Medianmean;Median 