SOLUTION: A nonprofit organization conducted a survey of 2100 metropolitan-area teachers regarding their beliefs about educational problems. The following data were obtained: 870 said that

Question 921303: A nonprofit organization conducted a survey of 2100 metropolitan-area teachers regarding their beliefs about educational problems. The following data were obtained:
870 said that lack of parental support is a problem.
860 said that abused or neglected children are problems.
680 said that malnutrition or students in poor health is a problem.
120 said that lack of parental support and abused or neglected children are problems.
90 said that lack of parental support and malnutrition or poor health are problems.
130 said that abused or neglected children and malnutrition or poor health are problems.
30 said that lack of parental support, abuse or neglect, and malnutrition or poor health are problems.
What is the probability that a teacher selected at random from this group said that lack of parental support is the only problem hampering a student's schooling? Hint: Draw a Venn diagram. (Round your answer to three decimal places.)
I have drawn the venn diagram but I'm still not sure. I thought to subtract the 120,130,90,30 from 870 then divide that by 2100 but that's wrong. So I'm not sure what to do.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!

690/2100=
0.329
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