You are not logged in.
A standard measure of test anxiety is knnown to produce a u=19. In the sample you draw of 86 the mean is equal 17.5 with a standard deviation s=10.
In mathematics, you don't understand things. You just get used to them.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.