modal class = 146-148
l (lower term) = 146
h (height) = 2
f0 = 9
f1 = 12
f2 = 9
MODE = l + [ f1 -f0 / 2(f1) - f0 -f2 ] *h
=146 + [ 12-9 / 2(12) - 9 - 9 ] *2
=146 + [ 3 / 24 - 18 ] * 2
=146 + [ 3 / 6 ] *2
=146 + [ 1 / 2 * 2 ]
=146 + 1
=147 is the modal height ANSWER