Question

the average of 30 observations is 45. if three new observation 42,44,48 be added.find the new average

Answer 1

Answer:

hey!

Step-by-step explanation:

question:-the average of 30 observations is 45. if three new observation 42,44,48 be added.find the new average

ans . let the sum of the 30 observations be x

ATQ ,

average = sum of total observation / no. of observations

45 = x / 30

x = 45*30

x = 1350

now , three new observation 42,44,48 be added.

so new average = x +(42+44+48)/ 30+(3)

=> 1484/33

=>44.969696......

rounding off to nearest hundered

4

:)

Answer 2

Answer:

Sum of the 50 observations =36×50=1800

Two observations 30 and 42 are deleted

then sum of the remaining 48 observations =1800−[30+42]=1728

Therefore req. mean =

48

1728

=36