The ages of students at a school are uniformly distributed from 6 to 11 years old. 43 students were randomly selected and asked their age. The distribution of each individual student's age is uniform. The distribution of the average age of the 43 students is normal with the mean equal to the average of the uniform distribution range and standard deviation equal to the uniform range divided by sqrt(43). The probability that the average age of the 43 students is between 8 and 8.6 years can be calculated using the normal distribution.