(a) The sample mean GPA is approximately $2.34$ (rounded to two decimal places).

(b) The sample standard deviation is approximately $1.16$ (rounded to two decimal places).

Would you like more details on how the calculations are done or have any questions?

Here are five related questions you might explore:

1. How would you calculate the variance for this sample?
2. How does changing the sample size affect the standard deviation?
3. What is the difference between population standard deviation and sample standard deviation?
4. How would the results change if one GPA was significantly higher or lower than the others?
5. How can you use the standard deviation to analyze the spread of GPAs?

Tip: For sample standard deviation, always use $n-1$ (degrees of freedom) in the denominator to get an unbiased estimate.