A sample has n 7 scores with a mean of M 7 if one individual

A sample has n= 7 scores with a mean of M= 7. if one individual with a score of X= 1 is removed from the sample, the new mean will be M= 8.

is this false?

Sum = M * n

Then

Sum = 7*7 = 49

Now, a score of x = 1 is removed.

hence,

New Sum = 49 -1 =48 [FIRST STATEMENT]

Now, it says that

New sum = New M * New n

As New M = 8, New n = 6,

New Sum = 8*6 = 48 [SECOND STATEMENT]

THUS, IT IS TRUE, as the two statements matched. [TRUE]