Question

Mean of 10 observations is 32.2. if by mistake, one observation is taken as 4, in place of - 4 . Find the correct mean A) 34 B) 32.2 C) 31.4 D) None of these​

Answer 1

Answer:

Step-by-step explanation:

total sum = 32.2 *10 = 322

so difference in the sum of observations is 4-(-4)= 8

so 322-8/10 is the real mean

=314/10

=31.4

so answer is option c

Answer 2

Answer:

C) 31.4

32.2=×/10

×=322

322-4-4

314

×=31.4