a)A mean of 14,12,19,23 is 17
b) if a 5th number is added it means a new mean and the mean is 15 what is the = answer
a- 17 X 4=68 sum of the 4 terms. If mean is 15, then,
15 X 5=75, therefore the 5th term must be:
75 - 68=7 the 5th term
