Figure 2 illustrates a normal distribution of test scores with a mean of 100 and a standard deviation of 15. The standard deviation is an indication of the variability of scores in a population (Mather & Jaffe, 2002).nderstanding Standard Scores. The major purpose of standard scores is to place scores for any individual on any variable having any mean and standard deviation on the same standard scale so that comparisons can be made.
Note: True symptoms of PMS do not begin until after Day 13, any symptoms you experience earlier in your cycle may have another cause. However, you should still include any symptoms you experience on Days 1 to 13 on your menstrual cycle calendar.
Rating Newest Oldest. Best Answer: No, guys! Afternoon doesn't start AT noon or 12:00 AM (which is midnight)! It starts AFTER NOON! That's 12:01 (twelve-o-ONE) P. M.--one minute AFTER noon! As for when afternoon ends, that would be as soon as evening starts--which isn't QUITE as cut-and-dried as when noon hits and when morning starts and ends (which times aren't up for debate, by definition).