Question 1065695
N(x) = 0.0336x^3 − 0.118x^2 + 0.215x + 0.7 (0 ≤ x ≤ 7).  x=0 for 50-54
N(0)=0.7, because all the x s are 0.
At 85-89, x=7
n(7)=343(0.0336)-0.118(49)+0.215(7)+0.7=7.9478=7.9