What is the formula of arithmetic mean in step deviation method?

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mean=a+ h* (Fi*Ui/N).
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Math Teacher

Mean = A + h .
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Knowledge is Power

x bar=A+h (u bar).
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Be a Educate Person

see the attached image to get answer...
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Computer Wizard

x1+x2+.........+xn/n.
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Software Engineer

a+ h* (Fi*Ui/N)
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