Use the following to answer questions:
Refer to the graph below.

-According to the graph, an identical twin's lifetime risk of developing schizophrenia when his twin has it is _______ percent higher than that of a fraternal twin whose twin has it.
A) 4
B) 8
C) 31
D) 42

Question

Use the following to answer questions:
Refer to the graph below.
 
-According to the graph, an identical twin's lifetime risk of developing schizophrenia when his twin has it is _______ percent higher than that of a fraternal twin whose twin has it.
A) 4 
B) 8 
C) 31 
D) 42

Quizplus · Accepted Answer

According to the graph, the lifetime risk of developing schizophrenia for identical twins when their twin has it is 48%. For fraternal twins, it is 9%. The difference between the two is 48-9=39, which means the identical twin's lifetime risk is 39% higher than that of a fraternal twin. Therefore, the answer is 31%.

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