Consider interest rates on accounts at a sample of local

Question

Question: Consider interest rates on accounts at a sample of local banks:

3.00%, 4.50%, 4.90%, 3.50%, 4.75%, 3.50%, 3.50%, 4.25%, 3.75%, 4.00%

a. Find the standard deviation of these interest rates.

b. What does this standard deviation tell you about banks in this area?