I think its.......5/15=1/3
See the attached picture:
Solution:
Given the mean and standard deviation;

The z-score formula is;

(a)

(b)

(c)
Hi there!
Let's break this down:
Two times a number = 2n
Increased by 5 = + 5
is 15 - = 15
Total equation:
2n + 5 = 15
Solving:
2n + 5 = 15
2n = 10
n = 5
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
C, because 12 squared plus 16 squared equals 544, then you take the square root of