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# What is the formula for Harmonic mean?

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

Tutor

Harmonic mean a1, a2,...an is given by: n/(1/a1 + 1/a2 .....1/an )

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Harmonic Mean is the reciprocal of the arithmetic mean of the reciprocals. In other words, it is the number of observations, divided by the sum of reciprocals of the observations.

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.

PCM

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,...
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...
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

Maths Teacher

Harmonic mean is the reciprocal of arithmetic mean of the reciprocals If "a" and "b" are two numbers, then harmonic mean = 2 / ((1/a) + (1/b))

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

Tutor

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...
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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Formula of A P
an = a+(n-1)d Where an=last term a=first term d=common difference n=number of term Note: last term is denoted by an or l Sn=n/2[2a+(n-1)d Sn=sum of all terms

Manjeet Khajuria | 19/10/2022

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