Study Easy for TNPSC IBPS SSC Exams
1 second Tricks
Average
Lesson 1
26, 28, 30, 32, 34 = ?
96, 97, 98, 99, 100 = ?
52, 54, 56, 58 = ?
43, 44, 45, 46 = ?
Average = Sum of observation / Total number of observation
For example:
Calculate Average for 10, 40, 20, 50
Sum of observation = 10 + 40 + 20 + 50 = 120
Total number of observation = 4
Therefore Average = 120/4 = 30
How to easily calculate the average?
Case 1: Consecutive Number:
x, x+1, x+2, x+3, x+4
Case 2: Consecutive Odd Number:
x, x+2, x+4, x+6, x+8
Case 3: Consecutive Even Number:
x, x+2, x+4, x+6, x+8
Tricks:
If you see the sequence is consecutive, middle number is average.
101, 102, 103, 104, 105 = 103
101, 102, 103, 104 = 102.5
81, 83, 85, 87, 89 = 85
81, 83, 85, 87 = 84
66, 68, 70, 72, 74 = 70
66, 68, 70, 72 = 69
Practice yourself:
Calculate Average:
26, 28, 30, 32, 34 = ?
96, 97, 98, 99, 100 = ?
52, 54, 56, 58 = ?
43, 44, 45, 46 = ?
23, 25, 27, 29, 31 = ?
45, 47, 49, 51 = ?
