these variables is shown below.

$f(x,y)=(\frac{1}{6})(5x+7y),0x1,0y1$

Find the probability that in a given box the creams account for more than $\frac{1}{2}$ of the weight.

a$.\frac{55}{64}$

b$.\frac{11}{54}$

c$.\frac{31}{48}$

d$.\frac{13}{54}$

e$.\frac{29}{48}$