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Sergio [31]
3 years ago
9

In a survey at a local​ university, 15% of students say that they get less than the recommended eight hours of sleep per night.

In a group of 3000 ​students, how many would you expect get eight or more hours of sleep per​ night?
Mathematics
1 answer:
xxTIMURxx [149]3 years ago
5 0

Step-by-step explanation:

450. 15% of 3000 is 450. 450 students get eight or more hours of sleep per night.

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\text{P(Black or Face)}=\text{P(Black)+P(Face)-P(Black and Face)}\\\\\Rightarrow\ \text{P(Black or Face)}=0.00183+0.05522-0.00006\\\\\Rightarrow\ \text{P(Black or Face)}=0.05699

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