Question 1

G6 =SUM(B6:F6)
H6 =IF(G6>=F$2,B$2,0)
I6 =B$1*G6+H6
J6 =RANK(I6,I$6:I$13,0)
B15 =AVERAGE(B6:B13)
B16 =MAX(B6:B13)
B17 =MIN(B6:B13)
D19 =COUNTIF(H6:H13,B$2)

Question 2

G3 =D3*D$1+E3*E$1+F3*F$1
H3 =IF(G3>=K$3,L$3,IF(G3>=K$4,L$4,L$5))
I3 =RANK(G3,G$3:G$8,0)
M3 =COUNTIF(H$3:H$8,L3)
M7 =SUM(M3:M6)
N3 =M3/M$7
D10 =AVERAGE(D3:D8)
D11 =MAX(D3:D8)
D12 =MIN(D3:D8)

Question 3

B2 =UPPER(A2)
C2 =LOWER(A2)
D2 =SUBSTITUTE(C2," ","_")
E2 =CONCATENATE(D2,"@shcc.edu.hk")
C9 =TODAY()
C11 =C9+1000
C12 =C9-C10
B2 =A2^2+2*A2-1
D1 =RANDBETWEEN(0,9)
D2 =VLOOKUP(D1,A1:B10,2,FALSE)