The zscore distribution contains 100 of all scores within 3

The z-score distribution:

contains 100% of all scores within -3 and +3 standard deviations.

has a mean of 0 and a standard deviation of 1

has a mean of 0 and a standard deviation of 10.

is positively skewed.

Solution

In a standard normal distribution (mean:0 and SD:1) almost 100% scores are between -3 and 3.

So option \"has a mean of 0 and a standard deviation of 1\" is correct.