Select the correct graph. The ideal speed of an elevator is 120 feet/minute. But the elevator's speed is allowed to vary by less than a certain amount. Identify the graph
of the variance levels that indicate unacceptable elevator speeds.
+200
180
-160
-140
20
+10
30
YA
+200
+180
+160
8 +140
8120
Variance in Speed (feet/second)
Variance in Speed
-50
40
+20
38 40 60 80 100 120 140 160 180 200 220 240 260 280
Speed (feet/second)
&+100
+80
+60
+40
-20
+ + +
-28 40 60 80 100 120 140 160 180 200 220 240 950 280
Speed (feet/second)
у
+200
+180
+-160
+-140
---120
&+100
y
200
-180
-150
140
120