Psychology math practice
Every calculation the Psychology exam asks for, with new numbers every time. Type the answer rather than picking from four options — producing a number is a different skill from eliminating three wrong ones, and only one of them is what the exam scores.
Mean, median and skew
In a skewed distribution the mean is pulled toward the tail and the median is not, so which one a study reports tells you something about the data.
Calculate the mean of this data set: 8, 22, 30, 1, 18, 24, 27, 12, 30.
Every skill in this set
- Mean, median and skewScientific Foundations of Psychology
- mean = Σx / n
- In a skewed distribution the mean is pulled toward the tail and the median is not, so which one a study reports tells you something about the data.
- Standard deviation and the normal curveScientific Foundations of Psychology
- 68% within 1 SD · 95% within 2 SD · 99.7% within 3 SD
- IQ questions are the standard application: a mean of 100 and an SD of 15 means about 68% of people fall between 85 and 115.
Common questions
What math is on the AP Psychology exam?
2 distinct calculations: mean, median and skew, standard deviation and the normal curve. Each one appears on the exam's formula sheet or is assumed by it, so the work is applying the relationship rather than recalling it.
Do the problems repeat?
No. Every problem is generated with fresh numbers, so the same skill can be practiced indefinitely without memorizing an answer. That is the whole point — being able to run a procedure on numbers you have not seen is what the exam actually tests.
How precise does my answer need to be?
Answers are accepted within about 1–3% of the exact value, which allows for rounding at intermediate steps the way a calculator does. Units are optional — type the number and the unit if you like, or just the number.