Professor Gersch grades his midterms and then takes a sample of eight tests and notices their grades: 87, 79, 85, 68, 82, 86, 76, 91.
Find the first quartile Q1.
a. 
77.5 

b. 
83 

c. 
86 

d. 
81 

e. 
None of the others are correcct. 
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