Concept And Short cut Of Average

Average
Concept
Average
is very useful for summarizing any quantity. For example we can say temperature
of the city. The city may have different temperature throughout the week. But
if we want to give single figure for it or we want to summarize it then we are
using average.

Basic
formula:-
For
example
:-
if
we want to find average temperature of the city for the week. Temperatures for
the days of the week are
Sunday:
33 °C                 
Monday: 34 °C
Tuesday:
35
°C               
Wednesday: 36 °C
Thursday:
35
°C             
Friday: 35 °C
Saturday:
36 °C
Average
= (33+34+35+36+35+35+36)/7 = 34.85 °C
Shortcut
Methods For Average

TYPE
– I

Rule
1:
If
different distance is travelled in different time then,

Rule 2:
If
equal distance is travelled at different speed.
If
equal distance is travelled at the speed of A and B then,

Rule 3:
If
equal distance is travelled at the speed of A, B and C then,

TYPE
– II

Note:-
When a person leaves the group and another person joins the group in place of
that person then

Rule 1:
If the average age is increased,
Age of new person = Age of separated person + (Increase in average × total
number of persons)
Rule 2:
If
the average age is decreased,
Age of new person = Age of separated person – (Decrease in average × total
number of persons)
Rule 3:
New
average age of group = 


TYPE
– III

Note:-
When a person 
joins the group.

Rule
1:

In case of increase in average
Age
of new member = Previous average + ( Increase in average × Number of members
including new member)
Rule
2:
In
case of decrease in average
Age
of new member = Previous average – ( Decrease in average × Number of members
including new member)
Rule
3:
New
average of group =

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72 Comments

  1. Tnx, 🙂

    Could anyone provide me SSC heldesk email-id(?). I have completed Part-I registration of SSC CGL 2015. But when I am going to do Part-II registration, then It is showing "Wrong information entered".

  2. Shri Wren Mishra
    Deputy Director (NWR)
    Staff Selection Commission
    Block No.3, Ground Floor
    Kendriya Sadan, Sector – 9
    Chandigarh – 167 017
    Tel.No. 09915509204, 09915509331

  3. Ok. Tnx 4 info. I can see many applicants r facing the same problem. So I will wait if SSC can do something.

  4. Mam can u plz provide a pdf of science subjects as like history n politics..it will be a great use for reference.

  5. Mam plzz help… i'm filling my sister's SSC CGL form .. she is 26 yr 8 mnths as on 1st aug 2015,,, but when i'm submitting the form it's contineously showing me the msg "as per age criteria u r not eligible"… why that is so?? when the age criteria for allmost every post is 27 yr..

  6. capsules on these subjects are already on SSC adda.Please search them in search box they are in PDF formate.

  7. We will post Shriya but right now students have some queries about SSC form and exam.So first we try to Resolve these queries and after that we will post Quizes on daily bases like always:)

  8. There is some probkem in SSC site.many students have same issue,Wait for some time.

  9. thanks mam.and as that is not a completed form so i can fill a new form?

  10. Madam mera tu part 1 hi nahi ho raha h avi lagta h ki kuch problem chal raha h site me

  11. Sab information tu same h form fill karne la jaisa last year tha koi tu changes nahi hua madam plz inform if any changes

  12. Mam/sir.
    ..how to prepare for statistical paper…plz give some light on the preparation strategy for this paper…plz..

  13. Mam/sir.
    ..how to prepare for statistical paper…plz give some light on the preparation strategy for this paper…plz

  14. i think tumne preferance m # wali fill ki h to form fill ni hoga use hta k form fill kro shayd ho jaye bcoz usme age 20-25 hi h…

  15. Hi Joy,

    I have same issue, I tried to fill some more post but I found some issue , I mean they accept after age 1/08/1990. for every post.

    I tried to fill post (#)(age-25), still accept the registration.

    But for rest post not accepting, I thought there is issue in CGL online form.

  16. yes after DOB 1/08/90 there is no problem with filling up the form.. but b4 that there are some serious issues… don't know what actually the problem is!! 🙁

  17. ::Types of Diseases::

    Type of Disease……………………Examples
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