Answer:
The answers are as follows:
After reading and comparing the values, we get the following answer.
Number of students with blue eyes blond hair  are 42.
Difference of the number of students with gray eyes and brown hair and number of students with green eyes and black hair is [tex]11-5=6[/tex]
Number of students with gray eyes brown hair  are 5.
Difference of the number of students with green eyes and blond hair and the number of students with gray hair is [tex]35-21=14[/tex] because only gray hair marginal total is 35.