Probability Z-Scores - need help with problems?
i) Find the probability that the average score of this group of students is higher than the average (i.e., 75).
ii) Find the probability that the sample mean deviates from the population mean by more than 1.5.
So for i) I'm a little confused because I assumed you would have to use the z score. But since x would be 75, it would be z = (75 - 75)/0.57 and that gives 0? That can't be the right probability, can it?
I straight up don't understand how to do ii). I would appreciate some help!