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Averages for Competitive Exam – Quantitative Aptitude

Averages (औसत) In Hindi

औसत, जिसे अंग्रेजी में “average” कहते हैं, संख्याओं के एक समूह का मध्य मान होता है। इसे विभिन्न प्रकार से परिभाषित किया जा सकता है, लेकिन सबसे आम परिभाषा अंकगणितीय माध्य (arithmetic mean) है।

अंकगणितीय माध्य ज्ञात करने के लिए, संख्याओं के योग को समूह में संख्याओं की संख्या से विभाजित किया जाता है। उदाहरण के लिए, 2, 3, 4, 5 और 6 का औसत ज्ञात करने के लिए, हम इन संख्याओं को जोड़ते हैं और फिर 5 से विभाजित करते हैं:

(2 + 3 + 4 + 5 + 6) / 5 = 4

इस प्रकार, इन संख्याओं का औसत 4 है।

Averages In English

Average typically refers to the arithmetic mean and is defined as the ratio of the sum of items to the number of items in a dataset.

Average = (\( \frac{Total   value   of   all   the   items}{Number   of   items} \))

For example: if we have to find out the average of 15, 25, 35 and 45, then the required average will be

\( \frac{(15   +   25   +   35   +   45)}{4} \) = \( \frac{(120)}{4} \) = 30

Similarly, finding the average of 30, 50 and 40,

\( \frac{(30   +   50   +   40)}{3} \) = \( \frac{(120)}{3} \) = 40

Symbol

The average is basically the mean of the values which are represented by x̄. It is also denoted by the symbol ‘μ’.

Average Formula

The formula to find the average of given numbers or values is very easy. We just have to add all the numbers and then divide the result by the number of values given. Hence, the average formula in Maths is given as follows:

Average = \( \frac{Sum   of   Values}{Number   of   values} \)

Suppose, we have given with n number of values such as \( x_1, x_2, x_3 ,…..,x_n. \) The average or the mean of the given data will be equal to:
Average = \( (x_1+x_2+x_3+…..+x_n)/n \)

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