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SATMathematics Practice Test 1

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Question : 41 of 58

Marks: +1, -0

Dreams Recalled during One Week

	None	1 to 4	5 or more	Total
Group X	15	28	57	100
Group Y	21	11	68	100
Total	36	39	125	200

The data in the table above were produced by a sleep researcher studying the number of dreams people recall when asked to record their dreams for one week. Group X consisted of 100 people who observed early bedtimes, and Group Y consisted of 100 people who observed later bedtimes. If a person is chosen at random from those who recalled at least 1 dream, what is the probability that the person belonged to Group Y ?

$\frac{68}{100}$
$\frac{79}{100}$
$\frac{79}{100}$
$\frac{164}{200}$

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