 # ML Aggarwal Solutions Class 9 Mathematics Solutions for Statistics Exercise in Chapter 20 - Statistics

A Explain the meaning of the following terms :

(i) variate

(ii) class size

(iii) classmark

(iv) class limits

(v) true class limits

(vi) frequency of a class

(vii) cumulative frequency of a class.

(i) Variant: A particular value of a variable is called variate.

(ii) Class size: The difference between the actual upper limit and the actual lower limit of a class is

called its class size.

(iii) Classmark: The class mark of a class is the value midway between its actual lower limit and actual

upper limit.

(iv) Class limits: In the frequency table the class interval is called class limits.

(v) True class limits: In a continuous distribution, the class limits are called true or actual class limits.

(vi) Frequency of a class: The number of tally marks opposite to a variate is its frequency and it is

written in the next column opposite to tally marks of the variate.

(vii) Cumulative frequency of a class: The sum of the frequency of all previous classes and that particular

class is called the cumulative frequency of the class.

Video transcript
"guys welcome to lido q a video i am vineet your leader tutor bringing you this question on your screen so this is a very easy and straightforward question so what does it say explain the meaning of the following terms so we are going to do just that okay so the first one is variate what is a variant a variate is a particular value of a variable right a particular value of a variable is called a variate right now what is class size these are all very easy definitions we all know this so class size is the difference between the actual upper limit and the actual lower limit of a class so this is the difference between the actual upper limit and actual lower limit so this is class size next would be class mark what is a class mark so plus mark is nothing but it is the value midway between its actually lower limit and actual upper limit so it is the value midway exactly in between the actual upper and lower limits right now what are class limits again we'll have to draw a line to bifurcate so here it is okay now we are looking at class limits what is a class limit we just saw in the previous definitions that we mentioned upper class limit and lower class limit right so in a continuous distribution the class limits are called true or actual class limits in a continuous distribution it is the true or actual loss limit actual class limit so then we just mentioned true or actual class limit so what is a true class limit so true class limits are again sorry so true class limits are this one is true class limits so let me rectify that so this will be number five actually okay so this will be number five that is true class limits and then number four we are going to define class limits so class limits are nothing but in the frequency table the class interval in a frequency table are class limits right now what is the frequency of a class again bifurcate frequency of a class frequency of a class is the number of tally marks opposite to a variant right is its frequency and it is written in the next column opposite to the tally marks so number of tally marks or the number of times of variate occurs in a data set is called as frequency and lastly cumulative frequency of a car plus so cumulative frequency of a class is nothing but the sum of frequency of all previous classes right it is the sum of frequency of all previous classes so isn't that easy guys if you still have a doubt please leave a comment below do like the video and subscribe to our channel i'll see you in our next video until then bye guys keep practicing keep flourishing"
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