6 x 11(n-1)
Hope that helps!
16-6n=20-2n
add 6n to both sides
16=20+4n
subtract 20 from boths ides
-4=4n
divide 4
-1=n
n=-1
Marcus score is 13.7, the mean is 12.89, and the standard deviation is 1.95, so I’ll do ( 13.7 – 12.89)/ 1.95, Since Marcus' z-score is 0.415. The area to the left of the z-score is 65.9% so therefore Marcus did scored better than 65.9% of the students. So Marcus needs to score 98% better of all the other students in order for him to receive an actual certificate.