Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 20
The sample mean is 
The standard deviation is 
Generally the standard error of the mean is mathematically represented as

=> 
=> 
-3(3x-5y-9) that’s the factored expression
Look up what is 75% of 31,500
This is a special 60-30-90 triangle, and the angle measure of x is