If the teacher’s age is included, the average age becomes 11 years. of persons in group × (Decreased in average) + New averageĮxample – 2 : The average age of 30 students is 10 years. The “ N” persons average (Age/weight) is “A”, If a person is excluded in this group, then its new average is “ M” excluded persons age/weight “ P” of persons in group × (Increase in average) + New average The “N” persons average (Age/weight) is “ A”, If a person is included in this group, then its new average is “ M” included persons age/weight ” P” The pass percentage of these classes are 80%, 70% & 60% respectively then find the pass percentage of the entire school? X nelements then the weighted average is given by the formula.Įxample-1 : A school has only 3 classes that contain 20, 30 and 10 students respectively. If we have “ n” groups with averages A 1,A 2, A 3, A 4 ……. When we have two or more groups whose individual averages are known, then to find the combined average of all elements of all the groups we use weighted average. G) If average of some numbers is ” A” and “N”is subtracted in each number, then new average is (A -N ). This means that if each of the 4 numbers of the set were replaced by 15 each, there would be no changes in the total.Ī) The average is always calculated for a set of numbers.ī) The average always lies above the lowest number of the set and below the highest number of the set.Ĭ) The net deficit due to the numbers below the average always equals the net surplus due to the members above the average.ĭ) The average of some numbers is “ A”, Now all numbers are multiplied by “N” then its new average equal to (A x N)Į) The average of some numbers is “A”, Now all numbers are divided by “N”then its new average equal to A / Nį) If average of some numbers is “A”and “N” is added in each numbers, then new average is (A + N). So average of set of numbers can also be defined as the number by which we can replace each and every number of the set without changing the total of the set of numbers.įor example, the average of 4 numbers 16, 18, 24 and 26 is ( 16 + 18 + 24 + 26)/4 = 84/ 4 = 21 The average is also known as arithmetic mean (AM). The basic formula for average of “M” numbers is n 1, n 2, n 3, n 4 ……. n m is I.e Average equals to the ratio of Sum of observations to Number of observations. In other words, it is an estimate of where the center point of a set of numbers lies. The averageof a number is a measure of the central tendency of a set of numbers. In this article provides average concepts and Average formulas with examples. In fact, even the most non-mathematical individuals regularly utilize the concept of averages on a day-to-day basis. List of Formulas for Average Tricks with Examples |Average aptitude shortcutsĪverage is one of the most important mathematical concepts that we use in our day-to-day life.
1.1.3 Average formula – 3? Average age /weight).1.1.2 Average formula – 2 ( Average age /weight).1.1.1 Average formula – 1 (Weighted Average).
1 List of Formulas for Average Tricks with Examples |Average aptitude shortcuts.