Me?

a set of test scores is normally distributed with a mean of 160 and a standard deviation of 12. lori received a score of 172. what was her percentile score?

a. 68%

b. 84%

c. 93%

d. 95%
idk how to do explain : )

Since 68% of the distribution is within one standard deviation of the mean, this means that 68/2 = 34% of the distribution lies above the mean and is less than one standard deviation away from the mean. 

 The mean is the halfway point of any normal distribution, so 50% of the distribution lies below the mean. 

 So 50+34 = 84%  distribution lies below the score of 172 because 172 is the point that is above the mean and it is one standard deviation away from the mean of 160.

a

step-by-step explanation: