Answer
a. $280000\ \Omega $.
b. $1680000\ \Omega.$
c. $1120000\ \Omega.$
d. $560000\ \Omega$
Work Step by Step
a. The black fourth band indicates a tolerance of $\pm 20\%$.
$$20\% \times 9200\Omega = (0.20)(1400000\Omega) =280000\ \Omega .$$
That is, the tolerance is $280000\ \Omega $.
b. The upper limit is
$$1400000\ \Omega + 280000\ \Omega=1680000\ \Omega.$$
c. The lower limit is
$$1400000\ \Omega - 280000\ \Omega=1120000\ \Omega.$$
d. The tolerance interval is then $$
1680000\ \Omega-1120000\ \Omega= 560000\ \Omega
.$$
