Fin dthe 20th, 40th, 60th, and 80th percentiles of the standard normal distribution. Solution The 20th percentile of the standard normal distribution is -0.84. That\'s because 20% of the observations fall below 0.25. The 40th percentile of the standard normal distribution is -0.25. That\'s because 40% of the observations fall below -0.25. The 60th percentile of the standard normal distribution is 0.25. That\'s because 60% of the observations fall below 0.25. The 80th percentile of the standard normal distribution is 0.84. That\'s because 80% of the observations fall below 0.84..