What does N(d1) = 0.6736 mean? Multiple choice question. There is a 67.36% probability that a normally distributed variable will be less than d1 standard deviations above the mean. There is a 67.36% probability that a normally distributed variable will be more than d1 standard deviations above the mean. There is a 67.36% probability that a normally distributed variable will be less than d1 standard deviations below the mean. There is a 6736% probability that a normally distributed variable will be less than d1 standard deviations above the mean