74. एक विद्यार्थी को 3,11,7,9,15, 13, 8, 19, 17,
21, 14 और x का अकगणितीय माध्य निकालने के
लिए कहा गया । उस माध्य 12 प्राप्त हुआ।
x के स्थान पर क्या होना चाहिए?
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