Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
The mean time to complete a certain stat quiz is 25 minutes, with a standard deviation of 5 minutes. Find the probability of a student taking.
1.) less than 15 minutes.
2.) Between 15 and 25 minutes.
3.)more than 25 minutes.
1 answer