Question

Arithmetic mean of nine observations is calculated as 38. but in doing so an observation 27 is mistaken for 72 find the actual mean of data​

Answer 1

Answer:

let

sum of the observations is x for 8 numbers

total observations = 9

mean=sum of observations/no.of observations

mean =32

32=x+72/9

32×9=x+72

288=x+72

x=288-72

x=216

sum of 8 observations =216

actual mean= 216+27/9

=

let

sum of the observations is x for 8 numbers

total observations = 9

mean=sum of observations/no.of observations

mean =32

32=x+72/9

32×9=x+72

288=x+72

x=288-72

x=216

sum of 8 observations =216

actual mean= 216+27/9

let

sum of the observations is x for 8 numbers

total observations = 9

mean=sum of observations/no.of observations

mean =32

32=x+72/9

32×9=x+72

288=x+72

x=288-72

x=216

sum of 8 observations =216

actual mean= 216+27/9

=243/9

=27