OpenStax, Statistics §3.2 Independent and Mutually Exclusive Events · Exercise 7 · Probability · Conditional probability
Independent and Mutually Exclusive Events · Exercise 7
The graph shown is based on more than 170,000 interviews that took place from January through December 2012. The sample consists of employed Americans 18 years of age or older. The Health Index Scores are the sample space. We randomly sample one type of Health Index Score, the emotional well-being score.
Find the probability that a Health Index Score is more than 81.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Statistics · §3.2 Independent and Mutually Exclusive Events · Exercise 7
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