यदि आठ प्रेक्षणों a, a - 7, a - 4, a - 9, a - 8, a - 5, a - 12, a - 1 का माध्य 34 है तो a का मान ज्ञात कीजिए।

1
\(121 \over9\)
2
\(146 \over7\)
3
\(159 \over4\)
4
\(165 \over11\)

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