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# Tutor profile: Rainella L.

Inactive
Rainella L.
Social science major but with a knack for all things STEM
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## Questions

### Subject:Psychology

TutorMe
Question:

Your friend Maria is at work when she realizes there is a loose thread hanging off her shirt. She cannot find a scissors anywhere. Her coworker Isabel then suggests she use a nail-clipper from her purse. Maria is skeptical about this weird use of a nail clipper but soon finds out that it works just as well. What cognitive bias has Maria's coworker helped her to overcome?

Inactive
Rainella L.

Maria has overcame functional fixedness. This is a concept in Gestalt psychology in which a person's cognitive bias causes one not to realize that an object can be used for something other than its intended purpose.

### Subject:Statistics

TutorMe
Question:

What is the probability of selecting a female participant from a sample population containing 25 females and 35 males?

Inactive
Rainella L.

The probability is a proportion of the total female participants divided by the total number of participants. 25/ (25 + 35) = 0.4167. Or 41.67%

### Subject:Algebra

TutorMe
Question:

A student scores a grade of 87% on a test given to a class of 28 students. He does better than 50 percent of his classmates. How many of his classmates earned a grade below an 87?

Inactive
Rainella L.

First, we must state what we know and determine which information is relevant. We know that the student has a grade of 87%. He has done better than all his classmates who have scored a grade of 86% and lower. It is also given that the number of students who scored below him is equal to 50%, or half, of his total class. With simple algebra, we can now calculate what is half of 28. This can be done in a number of fun ways: 1/2 multiplied by 28/1 = 28/2 = 14. OR 50/100 multiplied by 28/1 = 1400/100 = 14. OR 0.50 multiplied by 28 = 14. OR (Using proportion and solving for X) 50/100 = X/28 (crossmultiply) X=14.

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