railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Elementary Statistics

Consider the frequency distribution give below:

Class - interval  0 - 10  10 - 20 20 - 30  30 - 40 40 - 50
Frequency 4 6 10  16 14

The mean of the above data is: 

1
25
2
35
3
30
4
31
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