The distribution of sample means will not be normal when it
is grounded on small samples (n < 30) carefully chosen from a population
that is not normal because if n < 30, you would the use the t distribution. Normal
distribution would only be use if the sample size is large. Large in this case
relies on the requirements for accuracy and the shape of the underlying
population.
The answer is 52.94 because since it said he made to deposits of 89.32 you and that together and your result is 173.64 and then you subtract that from -125.70 and you get 52.94