Apopulation of n = 7 scores has a mean of m = 10. if one score with a value of x = 4 is removed from the population, what is the value for the new mean

Number of scores n = 7 
Mean of the total scores, m = 10 
One value is given that is x = 4. 
Calculating the total T = m x n = 10 x 7 = 70 
Total without the given value = 70 - 4 = 66 
Mean of the remaining scores would be 66 / 6 = 11.

I'm pretty sure it's b). i try drawing the functions out and b is the one that stands out or isnt a "line"