Answer:
Sample mean = 30
Standard deviation = 10
Step-by-step explanation:
A system with two linear equations can be modeled with the information given in order to find the sample mean (M) and the standard deviation (s):

Solving the linear system:

The sample mean is 30 while the standard deviation is 10.
Adding the two equations, you get that 3x=9, so x=3. Since there is only one value of x, there is only one solution.
Check the picture below.
make sure your calculator is in Degree mode.
Answer:
6
Step-by-step explanation: