stats
posted by AMbe .
2. The average age of a child in kindergarten is 66 months. The standard deviation is 4 months. If a random child is selected, find the probability that the mean age is:
a) Between 64 and 68 months
b) Greater than 62 months

You need to assume that the age distribution is normal.
Again, normalize the data which have a distribution of ~N(66,4²) and compute probabilities based on the looked up probabilities.