Which of the following is a characteristic of the standard normal probability distribution? a. The distribution is not symmetrical b. The mean, median, and the mode are not equal c. The standard deviation must be 0 d. The standard deviation must be 1

d) Standard deviation must be 1

Step-by-step explanation:

Distribution with coefficient 1 are high variance. Where as coefficient lower than 1 are lower variance. This depend upon your data.

So normal distribution property of standard deviation is that it must be 1