<prompt> The standard normal distribution:image_questionimage_questionimage_questionimage_question  <response>: Normal Distribution: Is also known as ;Gaussian distribution; or ;Standard distribution; Type of distribution: Is the distribution of values of a quantitative variable such that they are symmetric with respect to a middle value with same mean, median and mode, and then the frequencies taper off rapidly and symmetrically on both sides- ;bell shaped distribution; Fig: Normal curve showing distribution of values Normal or Gaussian curve Is ;bilaterally symmetrical and bell-shaped Is based on Mean and standard detion Mean, Median and Mode coincide MeanMedianMode Has mean m 0 and SDs 1 Mean - 1SD m -1s covers 68 values Mean - 2SD m -2s covers 95 values Mean - 3SD m -3s Covers 99 values In a normal distribution, 50 values lie above mean 50 below mean. Ref: Park 25th edition Pgno: 912 