Question

the mean of 10 observations is -12. by mistake one observation was taken as +6 instead of -6. find the correct mean.​

Answer 1

Answer:

-132

Step-by-step explanation:

mean=-12

$\frac{sum \: of \: observation}{number \: of \: observation} = - 12$

$\frac{sum \: of \: observation}{10} = - 12$

sum of observation=-120

+6 is taken as -6 therefore

difference between 6 and -6

-6-6=-12

correct mean = -120-12

= -132