A medical student studying anatomy records the average length of human eye lashes. Her sample of subjects includes both men and women in a ratio of two to three. Both the male and female samples have a normal distribution. Her study shows that two percent or fewer of men have eyelashes shorter than 0.35 cm and that two percent or fewer of women have eyelashes shorter than 0.67 cm. If men have an average eyelash length of 0.6 cm and women have an average length of 0.79 cm, what percentage of all subjects has an eyelash length greater than 0.85 cm?

A) 2%

B) 7.3%

C) 10.4%

D) 16%

E) 18%

The OA is C.

Can any expert explain this PS question please? i need help to solve it. Thanks.