we have the data set
768,769,814,895,901,913,937,963
so
Find out the mean
mean=(768+769+814+895+901+913+937+963)/8
mean=6,960/8
mean=870
Find out the median
768,769,814,895,901,913,937,963
median=(895+901)/2
median=898
Part a
$768 salary changes to $912
the new data set is
769,814,895,901,912,913,937,963
Find out the new mean
mean=(6,960-768+912)/8
mean=888
therefore
The new mean increases by $18
Part B
Find out the new median
769,814,895,901,912,913,937,963
median=(901+912)/2
median=906.5
therefore
It increases by $8.5