<prompt> A standard normal distribution hasA mean of 1 and a standard deviation of 1A mean of 0 and a standard deviation of 1A mean larger than its standard deviationAll scores within one standard deviation of the mean  <response>: B A mean of 0 and a standard deviation of 1 STANDARD NORMAL DISTRIBUTION is defined as a normal distribution with a mean of 0 a standard deviation of 1. Normal or Gaussian distribution is a very commonly occurring continuous probability distribution--a function that tells the probability that any real observation will fall between any two real limits or real numbers, as the curve approaches zero on either side. The figure below shows 99.7 of population fall within 2 SD. 