Name	Grade
John	87
Mary	93
Kate	88
George	94
For the given data frame, calculate the mean of the "Grade" column.
Based on the data you've provided, the mean of the "Grade" column is calculated as follows:

(87 + 93 + 88 + 94) ÷ 4 = 90.5

Therefore, the mean of the "Grade" column is 90.5.