7. What is the probability of obtaining a sample mean greater than M=50 for a random sample of n= 4 scores selected from a normal population with a mean of =60 and a standard deviation of =20?

10. A psychologist is interested in the conditions that affect the number of dreams per month that people report in which they are alone. In the general population the number of such dreams per month follows a normal curve, with = 5 and = 4. The psychologist studies 36 individuals and found that their mean number of alone dreams is 8. What is the Z score for this groups mean in the distribution of sample means?