# SSC CGL Exam (Tier-I): Quantitative Aptitude: Average: Concepts & Free Online Practice Set

Staff Selection Commission conducts Combined Graduate Level Exam for the recruitment to the different Group ‘B’ and Group ‘C’ posts. Jagranjosh.com has come up with SSC CGL Exam (Tier-I): Reasoning: Analogy: Concepts & Free Online Practice Set. Here, we provide concepts along with Free Online Practice Set to make the ease of students in cracking Average questions in exam.

**Averages**

The term Average refers to the sum of all observations divided by the total number of observations. Average is used quite regular in our day to day life. For example to calculate the average marks of the students, Average height of a particular group etc. The term average is also referred to as ‘Mean’. Basic formula to calculate the average is as follows:

**Solution: **First 10 Prime number are 2,3,5,7,11,13,17,19,23,29.

Hence, Average = {2+3+5+7+11+13+17+19+23+29} / 10

= 129 / 10

= 12.90

So, Average of First 10 Prime numbers is 12.90.

**Example. The total number of sales visits made by a Salesman in the month of June is 90. What is the Average visit he makes per day?**

**Solution: **Number of days in the month of June are 30

Hence, Average Visit per day = Number of total visits / Number of total days

= 90 / 30

= 3

So, the salesman makes 3 visits per day.