Question

. In the formula x bar = a + (( ∑fiui)/(∑fi) ) ×h for the mean ui =​

Answer 1

Answer:

Formula for step deviation method = A + ∑fiui÷ ∑fi × h

Where :

A = assume mean

ui =

$\frac{xi - a}{h}$

∑ = total frequency

∑fiui = f1u1 + f2u2 ........fnun.

h = length of the class interval.

∴ui =

$\frac{xi - a}{h}$

Answer 2

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$(x) = a +( \frac{fiui}{fi} ) \times h \\ mean \: (ui) = \frac{xi - a}{h} \\ where \: xi \: = class \: mark \\ a = assumed \: mean \\ h = class \: size$

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