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Harmonic Mean of 'a' & 'b' is = 2ab / ( a+b )

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A kind of average. To find the harmonic mean of a set of n numbers, add the reciprocals of the numbers in the set, divide the sum by n, then take the reciprocal of the result. The harmonic mean of {a1, a2, a3, a4, . . ., an} is given below. A kind of average. To find the harmonic mean of a set of n numbers,...

read more A kind of average. To find the harmonic mean of a set of n numbers, add the reciprocals of the numbers in the set, divide the sum by n, then take the reciprocal of the result. The harmonic mean of {a1, a2, a3, a4, . . ., an} is given below. A kind of average. To find the harmonic mean of a set of n numbers, add the reciprocals of the numbers in the set, divide the sum by n, then take the reciprocal of the result. The harmonic mean of {a1, a2, a3, a4, . . ., an} is FORMULA- H.M=N/(1/A1+1/A2+1/A3......1/An) read less

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The hyperbolic tangent function is an old mathematical function. It was first used in the work by L'Abbe Sauri (1774). This function is easily defined as the ratio between the hyperbolic sine and the cosine functions (or expanded, as the ratio of the half?difference and half?sum of two exponential functions...

read more The hyperbolic tangent function is an old mathematical function. It was first used in the work by L'Abbe Sauri (1774). This function is easily defined as the ratio between the hyperbolic sine and the cosine functions (or expanded, as the ratio of the half?difference and half?sum of two exponential functions in the points and ): read less

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The harmonic mean H of the positive real numbers x1, x2, x3, ...xn > 0 can be derived from the formula

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Easiest way to remember is = 1/(mean of reciprocals). e.g. say x1,x2,........xn are n observations. 1 so the HM(x) =------------------------------------------------------ 1/n(1/x1+1/x2+.....................1/xn) this can...

read more Easiest way to remember is = 1/(mean of reciprocals). e.g. say x1,x2,........xn are n observations. 1 so the HM(x) =------------------------------------------------------ 1/n(1/x1+1/x2+.....................1/xn) this can be explained better in person in stead of just by writing here in words. read less

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