Select the best answer for the following:
The tensile strengths of steel parts are given below: 670.5, 671.3, 670.5, 670.9, 690.6, 671.25, 670.45, 670.3, 671.2. Use this data to select the best answer for the following 4 questions:
1. What is the sample mean? A. 672.2 B. 670.9 C. 670.5 D. 673.0 E. None of the above.
2. What is the sample median? A. 672.3 B. 670.5 C. 670.9 D. 671.25 E. 690.6.
3. What is the sample mode? A. 670.45 B. 673.0 C. 670.5 D. 671.25 E. 690.6.
4. What is the sample standard deviation? A. 6.61 B. 5.77 C. 6.69 D. 6.5 E. None.