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If the mean of 20, 24, 36, 26, 34 and K is 30, then And K.

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If the mean of 20, 24, 36, 26, 34 and K is 30, then And K.

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Mean = \(\frac {Sum \,of\,items}{No \,of\,items}\)

30 = \(\frac {20+24+36+26+34+K}{6}\)

⇒ 180 = 140 + K 

⇒ K = 40

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