Adderall is a blend of four different amphetamine salts. Like Ritalin, Adderall keeps norepinephrine and dopamine working in the brain. But Adderall does something that Ritalin doesnât. It makes the cells pump out more of the neurotransmitters.
A standard normal distribution table shows a cumulative probability associated with a particular z-score. Table rows show the whole number and tenths place of the z-score. Table columns show the hundredths place. The cumulative probability (often from minus infinity to the z-score) appears in the cell of the table.
A random variable X whose distribution has the shape of a normal curve is called a normal random variable. Normal Curve. This random variable X is said to be normally distributed with mean Î¼ and standard deviation Ï if its probability distribution is given by. `f(X)=1/(sigmasqrt(2pi))e^(-(x-mu)^2 /2\ sigma^2`.he new distribution of the normal random variable Z with mean `0` and variance `1` (or standard deviation `1`) is called a standard normal distribution. Standardizing the distribution like this makes it much easier to calculate probabilities.