L2 : Classical Approach - Probability , Maths, Class 10 Video Lecture - Class 10 | Best Video for Class 10

hello friends this video on probability
part 2 is brought to you by exam fear
calm no more fear from exam before
watching this video please make sure
that you have watched part 1 and that is
the reason why we have the classical or
theoretical approach this is what we
will study so we'll focus on this so
since the earlier method has had this
advantage that is the is not consistent
and it is not possible to actually
perform the experiment every time so we
have the classical and emotion so here
we assume that the first thing is please
assume that all the experiments have
equal likely outcome and explain this
this is the assumption we are making
that all the events are equal likely out
when I say equal likely if example when
I say head and tail so this is equal and
this is equal to Verity of head in
priority of changing all the equal
likely that this probability of head
will always be 1 by 2 tail will always
be 1 by T so I am drawing a coin or from
ball it is bag that has red blue yellow
white and let suppose think an orange
awesome 6 color so in that case the
priority of red will always be 1 by 1 2
3 4 5 6 1 by 6 priority of blue will
always be one message this is the
assumption actually that all the
experiments have equal likely even
outcomes that this I mean in the earlier
case if you see in the earlier method
you have to actually wit take out red
and see what is the property it comes
sometimes it comes one by six
sometimes it come different also but in
this case it is assumed that whatever be
the scenario the variety of red always
be one by also the same formula here
also for morality of event is nothing
but no valid the number on favor ever
outcome by all possible outcomes correct
outcome favorables by all possible
outcomes also one more thing if you add
all the probabilities of the elementary
events that should give one example
probability of head plus primality of
tail should give month if you see here
or metric measurement is going to here
also know Verity of red board last
probability of blue ball if you add all
this way six balls that should become
one you see 1 by 6 plus 1 by 6 6 times
that gives also one more thing that is
any probability is always greater than
equal to 0 or less than equal to 1 so
when it is equal to 0 it means
impossible that it will never come for
example when I say when I from this set
of Oregon balls red blue yellow white
pink orange I want to withdraw a brown
ball but there is no brown this is black
nickname there is no wrong so in that is
brown will never come so it is hundred
percent that zero reserve become correct
so it is impossible event so when the
probability of any event is zero that is
impossible event and when it is one that
is it is sure short even so will discuss
all this but just understand that the
probability is always greater than equal
to zero or less than equal to one let us
take some example very simple example we
have to say which of the following have
equally likely the first thing is a
driver attempts to start a car the car
does not stop
is it a equally likely - the answer's no
why because it is not universally true
that it will have some fixed values this
will depend on the condition of the car
if it is this guy is starting a brand
new BMW the probability that it will
start is 100% sure short it will stop if
the driver is trying to start and very
old car this is not the problem
battery is not charged or there is no
oil then that case the probability it
will not start is high correct also it
depends on driver also the driver is
very new if he is given a good car also
he may not be able to start the car
he is not aware of how to start the car
so the driver starting the car depends
on two condition the experience of the
driver and the condition on the car
it is not independent of all this
mr.panda so he can say that this is not
a equally likely in correct the second
is a player attempt to shoot a
basketball she shoots or miss the shot
he also know correct why because it
depends on the quality of the player the
player is very experienced he is very
good he will definitely 90% chance is
there that he will hit the shot if the
player is very new guy he is not even
aware of basketball the person like me
10% chance is there that did ill hit 90
percent won't even hit correct so these
things depends on the quality of the
player correct a trial is made to answer
true or false question the answer is
right or wrong here if you see yeah this
is equal likely event why because here
the chances is 5050 50 percent it may be
correct 50 percent it may be wrong
because there are only two options so
you have that suppose a question you ask
true or false it will either be true or
false right or the if you if you attempt
a question also your answer may be
correct or incorrect there is only two
off and please note a trial is made here
if the same question was a student
answers to a question true or false to a
student answers to a true of a question
what is the probability is it a I mean
the answer is right or wrong is it a
equal probability meant then in that
case we can say in
because in the student is a topper he
the chances that he will give correct
answer is more in the student is a
backbencher or he is not that good the
chances that he may get as give the
answer is incorrect so that case it
depends on the quality of the student
but in this case the question clearly
says it is a trial at just a trial is
made without even looking we are just
giving to or false then in that case it
is 50 correct because here in trial we
are just blindly giving to or false the
next thing is a baby is born is it boy
or girl again here also it is yes why
because it is independent of factor it
is a lot sometimes you get boy girl
sometimes you get curl it is something
which we don't have control over
we can't even modulate all this thing we
can break this so in that case this is
also yes in the first two case we can
rig the event by improving or donating
the quality of driver or the clarity of
car or the quality of player but in
these two event we can't ring India will
win world campanha again this is also
not a equal likely win why because it
all depends how India is performing that
deal which is the comparative team there
are so many factors or the pitch quality
is so many factors so India will win cop
or not this is not a equal idea you will
pass math testing on again no why
because in this case you are involved
here India is involved these people can
drink in fact you can rig the total
number if you perform well if you
perform well in math test you will get
pass if you don't perform well if you
don't score if you don't practice you
may feel so it is you who can rig the
whole thing's it is not equally so here
if you see only two events are not equal
agreement because there is no one to
ring and the chances are chapter correct
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