Answer:
Step-by-step explanation:
5 boys play both hockey and volleyball (30-20-15=5)
Answer: Option C
Step-by-step explanation:
In group(1), the risk is= 5/2000 x 100
= 0.25
In group(2), the risk is= 5/1000 x 100
= 0.5
The sample relative risk is= 0.25/0.5
= 0.5
So, option C is correct.
Answer:
8
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22 is the answer for 23x-1 for x=1