$(20$ pts$)$

$3)$ Annual precipitations observed in a watershed along $2000$ to $2010$ are given in Table $2.$ It is suspected that the records of the station $21001$ were chanced at an unknown date. Using Double Mass Curve Method and utilizing the records of nearby stations $\backslash (-1802,1803,1804\backslash ),$ find if the records of $1801$ needs to be corrected and if so$,$ calculate the corrected values.

Note : X is the sum of the last three digits of your student number

Table $2$: Annual precipitations $($mm$/$year$)$

Figure $2$: Adjusted precipitation values $($Please use the grid above$)$