17. (6 points) The Experimental Primary School tallied the math exam scores for Class 5 (1), with an average score of 87.26. Upon rechecking the papers, it was found that Mingming's score of 98 was mistakenly recorded as 89. After recalculating, the class average score became 87.44. How many students are in the class?
【Solution】Solve: $(98-89) \div(87.44-87.26)$
$$
\begin{array}{l}
=9 \div 0.18 \\
=50 \text { (people) }
\end{array}
$$

Answer: The class has 50 students.