Step 7. To mark the stair railing, hold it in place, resting along the stairs, and mark it for the angled cut. Pre-drill the landing and treads for the balusters, using a special stair bit that drills the hole and then creates a thread to accept the baluster bolts.
What is interpolation? Interpolation is the process of estimating unknown values that fall between known values. In this example, a straight line passes through two points of known value. You can estimate the point of unknown value because it appears to be midway between the other two points. The interpolated value of the middle point could be 9.5.
Prefixes. To tell the difference between extrapolation and interpolation, we need to look at the prefixes âextraâ and âinter.â The prefix âextraâ means âoutsideâ or âin addition to.â The prefix âinterâ means âin betweenâ or âamong.â Just knowing these meanings goes a long way to distinguishing between the two methods.