Answer
The elevator floor pushes up on Oliver with a force of $642.4~N$
Work Step by Step
Let $F_N$ be the normal force of the elevator pushing up on the person in the elevator. Let $M$ be the person's mass.
$\sum F = Ma$
$Mg-F_N = Ma$
$F_N = M~(g-a)$
$F_N = (76.2~kg)~(9.80~m/s^2 - 1.37~m/s^2)$
$F_N = 642.4~N$
The elevator floor pushes up on Oliver with a force of $642.4~N$
