This is the data from a sample: 8, 2, 5, 4, 11, and 9. Find the sample average (the sample mean), the sample variance, and the sample standard deviation.
a) Sample mean: 6.5, Sample variance: 11.91, Sample standard deviation: 3.45
b) Sample mean: 6.5, Sample variance: 11.91, Sample standard deviation: 3.34
c) Sample mean: 7, Sample variance: 10.5, Sample standard deviation: 3.45
d) Sample mean: 7, Sample variance: 10.5, Sample standard deviation: 3.24