যদি \(\frac{60a}{8}, \frac{19a}{2}, \frac{69a}{6}, \frac{11a}{2}, \frac{27a}{6}\) -এর মধ্যমান 7.5 হয়, তাহলে 'a' এর মান কত হবে?

1
2
2
1
3
7.5
4
15

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