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RS Aggarwal Solutions Class 7 Mathematics Solutions for Probability Exercise 23 in Chapter 23 - Probability
Question 1 Probability Exercise 23
A coin is tossed 300 times and we get head: 136 times and tail: 164 times.
When a coin is tossed at random, what is the probability of getting (i) a head, (ii) a tail?
Answer:
Total number of trials = 300
Number of heads = 136
Number of tails = 164
Probability of getting a head = (number of heads)/ (total number of trials)
= 136/300 {divide both numerator and denominator by 4}
= 34/75
Probability of getting a tail = (number of heads)/ (total number of trials)
= 164/300 {divide both numerator and denominator by 4}
= 41/75
Video transcript
"hello students welcome to leto q a video
session
i am sef your science tutor and question
for today is
explain the meaning of terms compression
and
rare fraction in relation to
longitudinal wave
so compression compression is a
vibration of the object
when it advances when a vibration of the
object advances it pushes
and compresses the air that is in front
of it
thus this creates a region of high
pressure
the high pressure region you can see
here
this is the high pressure region the
dark ones
and this creates the high pressure
region the region is called compression
this is c compression
and as observed you can see
you can see the figure here c means
compression
and r means rare fraction let us see
what is rare friction
the compression begins to drift away
from the objects
that vibrates when the vibrating object
moves backward
it creates an area of low pressure known
as
rare fraction r this is the rare
friction
so you can see the figure
rare friction is a region of low density
this is the low density region
and where in the particles here
in low density region move away from
each other so
when the particles move away from each
other that is the low density when
particles come
closer to each other that is high
density the high density region is
compression
compression is the high density region
so these are compression and rare
fraction in relation to the longitudinal
wave so let us write it down
the whole explanation
compression occurs when vibrating object
advances
it pushes
and compresses the air
that is in
front of it
this creates the region of high pressure
and the region is called compression
denoted as c
as you can see in the figure it is
denoted as c
now rare fraction is the region of low
density
wherein the particles of the medium move
away from each other
on the other hand compressions are the
regions of high density
where particles of the medium are very
close to each other
so this is our answer if you have any
queries you can post it in our comment
section
and subscribe to leader for more q a
thank you for watching"
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