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एक छात्र के सरल आवर्त दोलन के 100 आवृत्तियों का समय 4 बार मापता है और उनको 90s, 95s और 92 5 पाता है। इस्तेमाल की गई घड़ी का न्यूनतम अल्पांश 15 है। तब मापे गये माध्य समय को उसे लिखना चाहिए-

(a) 92 + 5.0 s

(b) 92 + 1.8 s

(c) 92 + 3 s

(d) 92 + 2 s

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