PSAT Math Multiple-Choice Practice Question 406

Question: 406

A team of researchers studied the effect of sleep masks on rapid eye movement (REM) sleep. Study participants were divided into three groups: the first group did not wear sleep masks, the second group wore regular sleep masks, and the third group wore sleep masks that were contoured away from the eyes and lashes. The results of the study are shown in the following table.
No Mask
Regular Mask
Contoured Mask
Total
Experienced REM Sleep
14
33
78
125
Did Not Experience REM Sleep
34
29
22
85
Total
48
62
100
210

What percent of the participants who experienced REM sleep during the study wore a contoured mask?

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