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Find the difference between the median and mean of factors of 42. The factors of 21 are 1, 3, 7, 21 and its negative factors are -1, -3, -7, -21. Math will no longer be a tough subject, especially when you understand the concepts through visualizations.

The maximum frequency is 44, which is corresponding to the class interval 6 – 8. The political party A won the maximum number of seats. Frequencies of class interval 5 – 10 and 10 – 15 are equal, i.e. 11 each.

## Finding The Least Common Multiple of 21 And Another Number

The least common factor or we shall say the smallest number in common of any pair of integers is 1. Factors of 21 have 4 positive factors and 4 negative factors. Factors of 21 are actually all the integers that mean the entire positive, negative and whole numbers that we can divide into 21 evenly. What’s amazing is that 21 divided by a factor of 21 will be equivalent to another factor of 21. These can be thus expressed as either individual factors or as paired factors. This is typically a mathematical dissolution of a specific number.

Therefore, first we have to modify it to be continuous distribution. The major cause of women’s ill health and death worldwide is reproductive health conditions’. Make a frequency distribution of the digits from 0 to 9 after the decimal point. The concentration of sulphur dioxide more than 0.11 parts was for 8 days. Here, the observation with minimum and maximum value are 2 and 32 respectively. Following are five examples which are related to day-to-day life.

## Selina solutions for Concise Mathematics Class 7 ICSE chapter 21 – Data Handling [Latest edition]

2.The following data on the number of girls per thousand boys in different sections of Indian society is given below. Try to find out, with the help of your teacher, any two factors which play a major role in the cause in above being the major cause. ∵ Some of the classes are 84 – 86 and 86 – 88, etc.

The pair of numbers which gives 32 when multiplied is known as factor pairs of 21. Explore factors using illustrations and interactive examples. The factor of 21 is that number that divides 21 completely i.e., without any remainder.

## What are the Prime Factors of 21?

If there does not exist any common factor, the HCF is 1. This is also called the greatest common factor and is a crucial component of the common prime factors of two numbers. It is the largest factor or we can say the largest number the two numbers share as a prime factor. Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections. The questions involved in Selina Solutions are important questions that can be asked in the final exam.

- We plot the ordered pairs , , , and and join the points by line segments and obtain the frequency polygon of section A.
- Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
- Find the mean, the median, and the mode of 21, 24, 21, 6, 15, 18, 21, 45, 9, 6, 27 and 15.
- This will clear students doubts about any question and improve application skills while preparing for board exams.
- The questions involved in Selina Solutions are important questions that can be asked in the final exam.

The positive factors of 21 are all the numbers we can divide to obtain an even number. Median is a qualitative central tendency of a data. Mean is a quantitative central tendency of a data. We plot the ordered pairs , , , and and join the points by line segments and obtain the frequency polygon of section A. The given frequency distribution is not continuous.

Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 – 10. Selina solutions for Concise Mathematics Class 7 ICSE chapter 21 include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any.

The pocket expenses of Anuj, during a certain week, from Monday to Saturday were ₹85.40, ₹88.00, ₹86.50, ₹84.75, ₹82.60 and ₹87.25. The mean of a certain number of observations is 32. Find the resulting mean, if the observation is, increased by 60%.

Give five examples of data that you can collect from your day-to-day life. The mean is an appropriate measure of central tendency. 3.The following observations have been arranged in ascending order. If the median of the data is 63, find the value of x.

## Introduction to Factors of 21

21 candies are to be divided among 3 friends equally. The factors of 21 are all the integers that divide 21 without any remainder. Here, the class sizes are different therefore, we calculate the adjusted frequencies corresponding to each rectangle. The maximum number of leaves are not 153 mm long only, rather they are from 145 mm to 153 mm long. Draw a bar graph to represent the polling results.

Number of students appeared in an examination, obtained from newspapers. Find the mean, the median, and the mode of 21, 24, 21, 6, 15, 18, 21, 45, 9, 6, 27 and 15. Find the mean, the median, and https://1investing.in/ the mode of 12, 24, 24, 12, 30 and 12. The heights of 8 girls of a class are 140, 142, 135, 133, 137, 150, 148 and 138 respectively. Find the mean height of these girls and their median height.

It shows that maximum number of engineers have their residences at 5 to 15 km away from their work place. 1.Give five examples of data that you can collect from your day-to-day life. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams. Find the mean and median of all the positive factors of 72. We can simply find the least common multiple of 21 through an easy solution that rests in the lowest common multiple of two numbers.

## Statistics-NCERT Solutions

Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam. Factors of 21 are integers that can be divided evenly into 21. It has a total of 4 factors of which 21 is the biggest factor and the positive factors of 21 are 1, 3, 7, and 21. The sum of all factors of 21 is 32 and its factors in Pairs are and . Give one example of a situation in which The mean is an appropriate measure of central tendency. The mean is not an appropriate measure of central tendency but the median is an appropriate measure of central tendency.

Represent the data of both the teams on the same graph by frequency polygons. Yes, other suitable graphical representation is s frequency polygon’. Frequencies of class intervals 25 – 30 and 25 – 30 are also equal, i.e. 1 each. It shows that minimum number of engineers have their residences at 20 to 30 km away from their work place. Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

The mean of marks scored by 100 students was found to be 40, later on, it was discovered that a score of 53 was misread as 83. Following data shows the weekly wages (in ₹) of 10 workers in a factory. The number 21 is actually the product of two positive numbers other than 1 and itself which makes it a composite number. In other words, because find the medians of factors of 21 21 can be divided by one, itself and by 3 and 7, thus it is a composite number. A composite number is an integer that is divided by at least another natural number, apart from itself and 1, without leaving a remainder. The median is the middle number in a data set when the numbers are listed in either ascending or descending order.