the mean weight of 8 members is 15. if each number is multiplied by 2 what will be the new mean?
Answers
Answered by
35
mean weight is 8 member is 15 let x/8= 15
if each no. multied by 2 then total weight will be 2x so new mean 2x/2= 2*15 = 30
if each no. multied by 2 then total weight will be 2x so new mean 2x/2= 2*15 = 30
Answered by
74
mean weight = 15
total weight = 15 x 8 = 120
let the 8 numbers be
x1 , x2 , x3 , .... , x8
now x1 + x2 + x3 + ... + x8 = 120
new sum = x1(2) + x2(2) + ... + x8(2)
= 2( x1 +x2 + ... + x8)
= 2( 120 )
= 240
now new mean
= 240/8
= 30
total weight = 15 x 8 = 120
let the 8 numbers be
x1 , x2 , x3 , .... , x8
now x1 + x2 + x3 + ... + x8 = 120
new sum = x1(2) + x2(2) + ... + x8(2)
= 2( x1 +x2 + ... + x8)
= 2( 120 )
= 240
now new mean
= 240/8
= 30
RJ12345:
that is what i mean
Similar questions