If there are 12 girls it cant be 12*3. this would be 36 but the passage specifically said there were 12 girls. So with that information, we can divide. 12/3 =4.
The z-score for men at 64 inches is: Using a standard normal distribution table, we can see that the cumulative probability for a z-score of -1.866 is 0.031. The answer is 3.1%.
