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# Summary

7th Maths : Term 3 Unit 5 : Statistics : Summary

Summary

● Based on the purpose, appropriate data has to be collected and organised to find the representative of data.

● Representative of data are also known as measures of central tendency.

● Arithmetic mean is the most commonly used representative of data and is calculated by the formula.

Arithmetic Mean = Sum of all observations / Number of observations

● Mode is the value of the data which occurs maximum number of times.

● A data may have more than one mode as well as no mode.

● A data is of large size, mode can be found out after grouping.

● Median is the middle most value of the given data.

● To find the median for the given data,

(i) arrange the data in ascending or descending order.

(ii) If the number of terms (n) is odd, then{ [n + 1]/2} th                 term is the median.

(iii) If the number of terms (n) is even, then average of (n/2)th and ([n/2]+ 1)th terms  is the median

ICT Corner

Statistics

Expected outcome

Step – 1

Open the Browser and type the URL Link given below (or) Scan the QR Code. GeoGebra work sheet named “Mean-Median-Mode” will open. Change the number of students by typing your number. Right side you can see the Mean, Median and Mode.