Problem:
Column B contains the mark matching each of the grades shown in column A.
We want to grade each mark in column D by finding the mark closest to it in column B, and then retrieving the corresponding grade from column A.
Solution:
Use the INDEX, MIN, IF, ABS, and ROW functions as shown in the following Array formula:
{=INDEX($A$2:$A$6,MIN(IF(ABS($B$2:$B$6-D2)=MIN(ABS($B$2:$B$6-D2)),ROW($B$2:$B$6)-ROW($B$2)+1)),1)}
To apply Array formula:
Select the cell, press and simultaneously press .
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