In China, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly survey one Chinese 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to two decimal places. A. X ~ N( __ , __ )

B. Find the probability that the child spends less than 2 hours per day unsupervised.

C. What percent of the children spend over 12 hours per day unsupervised?

D. 60 percent of all children spend at least how many hours per day unsupervised?