Respuesta :
Answer:
97
Step-by-step explanation:
76+83+89+95+100=443
there are all 6 tests.
we consider marks of last lest as "X"
x should be added to total mark
to obtain average mark, total marks should divided by no. of tests.
(443+x)/6=90
443+x=90*6
443+x=540
x=540-443
x=97