In a frequency dist. if $d_{i}$ is deviation of variates from a number e and mean = $e + \frac{Σ f_{i} d_{i}}{Σ f_{i}}$ , then e is

Lower limit

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Assumed mean

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Number of observation

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Class interval

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Solution

The correct option is A Assumed mean
Formula of finding Mean using step deviation method is
mean = $e + \frac{Σ f_{i} d_{i}}{Σ f_{i}}$
where,
$e =$ Assumed Mean
$Σ f_{i} d_{i} =$ Sum of all $f r e q u e n c y (f_{i}) \times d e v i a t i o n (d_{i})$
$Σ f_{i} =$ Sum of all frequencies
Hence the correct answer is assumed mean.

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