As in the previous problem, 24 teenagers are randomly selected at a movie theater. If X is the number of teenagers who purchase popcorn before watching a movie, then the distribution of X can be approximated with a normal distribution, N(12,2.4), where the mean (μ) is 12 and standard deviation (σ) is 2.4.

Using this approximation, find the probability of 15 or 16 teenagers purchasing popcorn before a movie. You may use the portion of the Standard Normal Table below.