PSAT Math Multiple-Choice Practice Question 407

Question: 407

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

Based on the results of this study, if a company sold 12,000 of the contoured sleep masks, about how many of the consumers should experience REM sleep using the mask, assuming the participants in the study were a good representative sample?

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