please show formulas used.

D F G B C 1- What is the avergae grade for all students 1 2 3 2- what is the number of students with grade 85 or less 3. What is the average grade for 15 students 4 5 6 7 8 9 10 4- What is the maximum grade of marekting students 5. What is the grade percontrank of a student in year 2 and last name is "Sutton" 6. What is the average grade of students with first name starting with an "S" 12 13 14 15 16 17 18 fo A B C D ID 1 2 Year F Final Grade 90 87 86 24 First Name 1 John 2 Joana 3 Alice 4 Bob 5 Jesus 6 Maria 7 Joseph 8 Steve 9 Tom 92 E Subject 1 IS 3 AG BUS 4 Marketing 2 IS 1 Inerntaional 3 IS 1 Marketing 1 AG BUS 4 Hospitality Last Name Smith Adams Green Sutton Hernandez Khamos Tan Robinson Aben 6 79 95 84 80 78 9 10 11 12 13 14 15 16 17 18 19 20