MATHS - Statistics - Missing Value When Mean Known

The video tutorial explains how to find a missing value when given the mean. It covers the concept of mean as a form of average, calculated by dividing the sum of values by their count. The tutorial demonstrates reversing this process using multiplication to find original values. A scenario involving students' test scores is used to illustrate calculating mean for different groups and the entire class. The use of tables to organize data and solve problems is emphasized, showing how to find unknown sums or counts. Practical examples are provided to reinforce understanding.

What is the process to find the mean of a set of values?

How can you reverse the process of finding the mean to determine an original value?

In the scenario provided, how would you calculate the mean for boys and girls?

What steps would you take to find the total marks for the girls given the boys' total marks?

Explain how to find the number of people using the sum value and mean.