Question

The mean of 5 numbers is 27.if one more number is added to the collection ,the new average of the six numbers becomes 25.find the value of the sixth number​

Answer 1

Answer:

the sixth number is -2.

Answer 2

Answer:

15

explanation:-

let the five numbers be a,b,c,d,e

as mean eqalls to 27

=>(a+b+c+d+e)/5=27

=>a+b+c+d+e =135 -----eq .1

let the new number be 'y'

after adding mean becomes 25

=>(a+b+c+d+e+y)/6=25

from eq --1 we get (135+y)6=25

=>135+y=150 => y=15

therefore the new added number is 15