1. The problem statement, all variables and given/known data The distribution of the IQ of a randomly selected student from a certain college is N(110,16). What is the probability that the average of the IQ's of 10 randomly selected students from this college is at least 112? 2. Relevant equations I think we need P(Sample Mean - 110 >= 2) 3. The attempt at a solution My solution was Probability = (112-110)/1.6 = 1.25; 1-I(1.25)= 1-.8944 =.1056 The answer in the book is .0571, so I know I'm going wrong somewhere. Any ideas?