There are 2496 students in a school as on 1st April 2023. During the session, there were 186 new admissions whereas 43 students withdrew from the school. At the end of the session, there were 2539 students in the school, out of whom 1800 were boys and the rest were girls. In this case, which of the following figures represent a flow variable?
There are 2496 students in a school as on 1st April 2023. During the session, there were 186 new admissions whereas 43 students withdrew from the school. At the end of the session, there were 2539 students in the school, out of whom 1800 were boys and the rest were girls. In this case, which of the following figures represent a flow variable?
Solution
Option 1 -> Represents new admissions during the session - a flow measured over a period of time.
Option 2 -> Represents number of boys at end of session - a stock measured at a point in time.
Option 3 -> Represents total students on 1st April 2023 - a stock measured at a point in time.
Option 4 -> Represents total students at end of session - a stock measured at a point in time.
Hence, Option 1: 186 -> A flow variable is measured over a period of time and represents change or movement. The 186 new admissions occurred during the session (over a period), making it a flow variable. In contrast, options 2, 3, and 4 are stock variables as they represent quantities at specific points in time (snapshots). Similarly, the 43 withdrawals would also be a flow variable, but it's not among the options. -> correct
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