[tex] \frac{upper class limit+lower class limiz}{2} [/tex]
2025.[tex]2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.[/tex]
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2025.[tex]2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.2025.[/tex]