Question

Arithmetic mean of 98 items is 50.two items 60 and 70 were left during calculation.what is correct mean of all items?

Answer 1

Answer:

Step-by-step explanation:

as we have given mean and n

therefore we have to take out the sum of all the observations(x)

that is

x = mean × n

x= 30 ×100

x = 3000

now add the correct no. which were misread that is

add 23 and 11

and you will get

3034

now subtract the wrong no. that is

sub 32 and 12 from 3034

that will give you 2990

now it is your new sum of observations

therefore new mean will be

2990/100

=29.9

Answer 2

Answer:

Step-by-step explanation:

We know the formula of Arithmetic mean for ungroup data which is

A.M=Sum of all the items/num of item

arithmetic mean =50,num of item=98

so 98*50=sum

sum=4900

this sum is for  98 item

know  we add left value

=4900+60+70/100

we divide the sum with 100 because we add 2 more value

correct aritmetic mean=50.3