Answer:
Twenty percent of the distribution lies below A is not true.
Step-by-step explanation:
The middle 80% of a standard normal distribution lies between the points A and B, then the remaining 20% is equally divided by 2 and 10% of it lies below A, 10% lies above B.
Attached graph below, dark area represents middle 80%, 10% white area is right of the dark area and 10% is left of the dark area.
