Example: Mean Deviation Method Video Lecture | Mathematics (Maths) Class 10

hello friends this video statistics part
8 is brought Cuba exam clear calm no
more fear from exam before watching this
video please make sure that you have
watched part 1 to part 7 let's take one
more example in this will use step
deviation method to find again similar
question the table scroll expenditure on
foot or 25 households in the locality we
have to find the main expenditure so we
have this formula summation is a plus h
into fi UI by fi summation fi let us
draw the stable now the first thing is
up to observe is this is a group data
why the lower range 150 for this it is
150 or this is the higher end is 120 for
this the lower is 1 200 250 250 higher
is 300 and the lower is 300 also the
difference if you see is 60 here or the
difference is 15 here also differences
would be here also 50 and here also 2
this is a group later now for this
because the formula is summation of a
plus h then when a plus h into summation
fi UI by summation effect first thing we
need to find X I so X I will be conduct
us 150 might do that is 125 in this case
150 plus 200 by 2 that is 175 in this
case 200 plus 25 that is 225 in this
case 250 plus 3 n by 2 is 275
and in this case 300 plus 350 by 2 the
dense 320 these other balidaan X I now
if you assume 1 me so let me assume this
day is the mean because the middle part
so my a is nothing but 225 so to say di
is nothing but X I minus 225 so di is
excise it is 125 minus 25 that is minus
100 175 minus 225
50 - 25 - 225 in 0 to 75 - 25 50 and 325
- 225 now since we are using step
deviation you see the here 50 is the
common number 50 hundreds below 50 to
250 is about a 15 to 1 so 50 is a common
number so I'll assume that this guy is
50 actually H is equal to 50 so I divide
this by 50 so - 100 by 50 that is minus
2 minus 50 by 50 that is minus 1 0 by 50
that is zero you have T my 50 that is 1
and 100 by 50 that is - I got the values
of you I says - - this is minus 1 this
is 0 1 and T now I have to find fi UI
this need to multiply with this 4 into
minus 2 is minus 8 5 into minus 1 is
minus PI where we do 0 is 0 2 into 1 is
2 and 2 interviews if you add these what
you get is minus 7 and if you add a PI
what you get ho + 5 9 + 12 21 + 4 25
correct normal use the formula this is
nothing but a what is our of a 225 225
plus h is what 50 50 Sigma fi UI is
minus 7 and by 20 if you saw this
becomes 25 and this case can certainty -
putting this becomes 2 compared 11 so my
as you need for the mean here we 211 so
we can say that this is nothing but me
day leagues and each other
on foot
that is 211 rupees because this vilasa
very simple just we have applied the
step deviation method we have data data
on the expenditure on food or 24
household household we use step division
method to find the mean daily
expenditure on the food item
thank you visit exam viacom to watch
free it should be should be doers try
three on my test get the best quality
study materials study from the best
tutors and mentors and much more
thanks and serene