Friday, October 26, 2007

AVERAGES

AVERAGES

1.

Average = [ Total of observations/No.of observations ]


2.(i)When a person joins a group in case of increasing average Age         weight of new comer  =


[ (Previous Age + No.of persons) * Increase in Avg ]

   (ii)In case of decreasing Average, Age (or) weight of new comer  =


[ (Previous Age - No.of persons) * Decrease in Avg ]


3.When a persom leaves a group and another person joins the group in the     place of person left, then

   (i)In case of increasing average, Age (or) weight of new comer  =

[ (Age of person left + No.of persons) * Increase in Avg ]

   (ii)In case of decreasing Average, Age (or) weight of new comer  =


[ (Age of person left - No.of persons) * Decrease in Avg ]


4.When a person leaves the group but no body joins this group, then

   (i)In the case of increasing Average, Age (or) weight of man left  =


[ (Previous Age - No.of present persons) * Increase in Avg ]

   (ii)In case of decreasing Average, Age (or) weight of new comer  =


[ (Previous Age + No.of present persons) * Decrease in Avg ]


5.If a person travels a distance at a speed of x Km/hr returns to the original    place of y Km/hr then average speed is


[ 2.x.y/(x+y) ]


6.If half of the journey is travelled at speed of x km/hr and the next half at a    speed of x km/hr. Then average speed during the whole journey is


[ 2.x.y/(x+y) ]


7.If a person travels 3 equal distances at a speed of x Km/hr,
   y Km/hr,z km/hr.Then average speed during whole journey is


[ 3.x.y/(x.y+y.x+z.x) ]


8.
A½ 

[ 3.x.y/(2x*y) ]


9.A½


[ 3*L/[ (L/S1)+(L/S2)+(L/S3) ]


10.A½


4L/[ (L.S1)+(L/S2)+L/S3)+(L/S4) ]


11.A½


1/[ (x/100) * (1/S1) ] + [y/100) * (1/S2) ] + [ (z/100)*(1/S3) ]

4 comments:

RAJA said...

8.


[ 3.x.y/(2x*y) ]

9.A½


[ 3*L/[ (L/S1)+(L/S2)+(L/S3) ]

10.A½


4L/[ (L.S1)+(L/S2)+L/S3)+(L/S4) ]

11.A½


1/[ (x/100) * (1/S1) ] + [y/100) * (1/S2) ] + [ (z/100)*(1/S3) ]


kindly write the questions for the following as i am unable to under stand them

sandy said...

please give a brief description for formulae ..so that we can fetch more easily

sandy said...

8.




[ 3.x.y/(2x*y) ]

9.A½


[ 3*L/[ (L/S1)+(L/S2)+(L/S3) ]

10.A½


4L/[ (L.S1)+(L/S2)+L/S3)+(L/S4) ]

11.A½


1/[ (x/100) * (1/S1) ] + [y/100) * (1/S2) ] + [ (z/100)*(1/S3) ]
please give a clear idea for these formulae

vivek said...

i think your 2nd formulae doesnt work
exmp
consider a classroom of 39 stu's of 15 yrs of age and if teacher weight is included avg is increased by 3 months find age of teacher