Question

If 100 aberage is 284 and 70 is 290 find average of rwmaing 30

Answer 1

100 observations average is 284

let sum of 100 observations =x,

sum of 70 observations=y,

sum of 30 observations =z

x=y+z

x/100=284

×=28400

y/70=290

y=20300

z=x-y=8100

average of remaining 30 observations

=z/30

=8100/30

=270