Z-score is a statistical tool that is used to estimate the probability of finding a number in a normal distribution of data. A normal distribution is described as a function in which the mean is zero, the standard deviation is 1 and that the area under the curve is equal to 1.
The z-score at 86 is z = (86-80)/6 = 1. the probability to the right is 0.1587.
The z-score at 92 is z = (92-80)/6 = 2. the probability to the left is 0.9772.
The difference in probability is equal to 0.8185. We multiply this to the number of total students to get the answer.
Here is how you solve it, Divide 8.25 by 67(this gives you the price for one dollar) this would come out to .12. So in conclusion the tax for one dollar is twelve cents. Hope this helped.
11, 13, and 16. sorry if im wrong, and i hope this helps.
