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.

the answer is 200

step-by-step explanation:

the way the question is worded, it seems to imply the $264 interest is simple interest, not compound interest.

the simple interest for 2 years is $264; the simple interest for 1 year is $132.

$132 interest on a $600 investment means an interest rate of (132/600)*100 = 22%.

the value of $200 at 22% interest compounded annually for three years is

200%281.22%29%5e3

the amount of interest is that value, minus the original $200.

good job you smart son of a gun you are smarter that einstein. 7