Concept explainers
To graph: We have to sketch a graph representing the situation and plot it in graph as height of lift over time as, an elevator with people on ground floor and most of them get off at seventh floor but, the remainder get off at ninth floor and after that two people get on at tenth floor and carried to ground floor without any stop.

Explanation of Solution
Given Information
An elevator with people on ground floor and most of them get off at seventh floor but, the remainder get off at ninth floor. After that two people get on at tenth floor and carried to ground floor without any stop.
Graph
Interpretation
The graph has been divided into different slots and numbered accordingly. Detailed observation can be drawn by below mentioned phases accordingly
(1) This phase shows the lift escalating towards seventh floor, mostly filled, in upward line graph continuously.
(2) Shows lift is stopped as maximum people get off here and so, the graph line is parallel to x-axis.
(3) Shows lift again ascending towards ninth floor.
(4) Shows lift is stopped as all the remaining people get off here, so line is parallel to x-axis.
(5) Shows lift ascending from ninth floor to tenth floor.
(6) Shows lift stopped and two persons get in, so line is parallel to x-axis.
(7) Shows lift coming to ground floor without any breakage, so it is in straight downward path.
Chapter 4 Solutions
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