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If the mean of 10 observations is 20 and that of another 15 observations is 16. Find the mean of all 25 observations?

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Maths_Exponents and Power
Exponential Form = 100 = 102, where 2 is the power of 10. Laws of exponents: a-m = 1/ am a m * an = am*n am * an = am*n (am)n = am*n am / bm = (a/b)m a0= 1 (a / b)-m = (b/a)m (-1)odd = -1 (-1)even = 1 ( am / an ) = am-n
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here i m uploading solutions
https://www.youtube.com/watch?v=I5hYu0yuey0&t=211s pls go through that and find any difficulty pls feel free to ask... and give your comments...

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