Solution: We are given:
μ=180,σ=25,n=100
Therefore the standard error of the mean is



Answer:
3, 2, 2
Step-by-step explanation:
I will get you started.
Let sin x = u
Then 7sin^2x -14sinx+2=-5 become
7u^2 - 14u = - 5
7u^2 - 14u + 5 = 0
Steps:
1. Solve for u.
2. Back- substitute for u.
3. Take the arcsin on both sides to find the angle(s).
You finish.
Answer:
the answer I got is a=-the sign and but 2b under it +7