Answer:
305
Step-by-step explanation:
122/40=3.05
3.05*100
Http://www.homeschoolmath.net/teaching/md/multiplication_algorithm.php
this will help you
C. 1.07p
1.00 is for 100% of the cost and the .07 is for the tax.
Put together they will make a 90 degree angle so 15x+8x -2= 90 combine like terms you get 23x-2=90 +2= 92= 23x now 92/23 is 4 so x= 4
Answer:
The 7th percentile is 34.2
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean
and standard deviation
, the zscore of a measure X is given by:
![Z = \frac{X - \mu}{\sigma}](https://tex.z-dn.net/?f=Z%20%3D%20%5Cfrac%7BX%20-%20%5Cmu%7D%7B%5Csigma%7D)
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this problem, we have that:
![\mu = 46, \sigma = 8](https://tex.z-dn.net/?f=%5Cmu%20%3D%2046%2C%20%5Csigma%20%3D%208)
Find the 7 th percentile.
The value of X when Z has a pvalue of 0.07. So it is X when Z = -1.475.
![Z = \frac{X - \mu}{\sigma}](https://tex.z-dn.net/?f=Z%20%3D%20%5Cfrac%7BX%20-%20%5Cmu%7D%7B%5Csigma%7D)
![-1.475 = \frac{X - 46}{8}](https://tex.z-dn.net/?f=-1.475%20%3D%20%5Cfrac%7BX%20-%2046%7D%7B8%7D)
![X - 46 = -1.475*8](https://tex.z-dn.net/?f=X%20-%2046%20%3D%20-1.475%2A8)
![X = 34.2](https://tex.z-dn.net/?f=X%20%3D%2034.2)
The 7th percentile is 34.2