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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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