I need help figuring this out please refer to the screenshot thank you in advance!

Three students were applying to the same graduate school. They came from schools with different grading systems. Student GPA School Average GPA School Standard Deviation Thuy 2.6 2.8 0.8 Vichet 89 81 10 Kamala 8.2 8.1 0.5 Table 2.74 How many standard deviations is each student away from hiir school average? If the student GPA is higher than his school average, enter this as a positive number. If the student GPA is lower than his school average, enter this as a negative number. Thuy is Number standard deviations from Thuy's school average. Vichet is Number standard deviations from Vichet's school average. Kamala is Number standard deviations from Kamala's school average. Which student had the best GPA when compared to other students at his school? O Thuy O Vichet O Kamala