SAT math Q21 calculator allowed #shorts

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 A consisted of 100 people who observed early bedtimes, and Group B 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 B ?

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