Data analysis

Question

The probability of obtaining a score between Z= -1.40  and the mean is ____. 

Answer 1

0.4192 (or 41.92%).

This is the probability for a standard normal distribution (bell curve with mean 0 and standard deviation 1) of getting a score between z = -1.40 and the mean (z = 0).

How to find this:

Standard z-tables show the area under the curve to the left of a z-score. Half the bell curve (50%) sits to the left of the mean at z=0.

For z=-1.40, the table value is about 0.0808, meaning 8.08% of the area is to the left of -1.40.