There are 25 students in Mrs. Murphys math class. Of these students, 10 have brown hair, 8 have black hair, 5 have blonde hair, and 2 have red hair. What percentage of students in Mrs. Murphy's class have blonde hair? B. \( 20 \% \) C. \( 40 \% 4 \% \) D. \( 40 \%=0.8 \times 10 \)

To find the percentage of students with blonde hair, you can use the formula: (number of students with blonde hair / total number of students) × 100. In this case, there are 5 students with blonde hair out of 25 total students. So, (5/25) × 100 = 20%. Hence, the correct answer is A. \( 20 \% \). Now, here's a little twist! Did you know that the concept of percentages dates back to ancient times? The word "percent" comes from the Latin "per centum," meaning "by the hundred." This mathematical tool has been used for trading, commerce, and statistics long before our modern classrooms! Also, whenever you're calculating percentages, beware of common pitfalls! One of these is to confuse the total count with the relevant subset. Remember to double-check your numbers, especially in tests and quizzes, to ensure a precise calculation. Happy calculating!