Answer:..
Step-by-step explanation:
...
Answer: a. $128.125
Step-by-step explanation:
The standard error of the mean is given by :
, where
= population standard deviation , n= sample size.
Given: 
n= 256
Then, the standard error of the mean:-

Hence, option a. is correct.
Answer:
9
Step-by-step explanation:
I think these two triangles are similar so UT is similar with UC and US is similar with BU after that you should do it 12-BU is it enough?
Im so sorry i need points but
9514 1404 393
Answer:
36°
Step-by-step explanation:
Each exterior angle is 360°/5 = 72°. This is the base angle of the isosceles triangle formed by drawing a line opposite angle y at the corners of the pentagons.
The angle y is ...
y = 180° -2(72°)
y = 36°