The grade point averages​ (GPA) for 12 randomly selected college students are shown on the right. Complete parts​ (a) through​ (c) below.
Assume the population is normally distributed.
2.4
3.2
2.7

1.8
0.7
4.0
2.3
1.1
3.5
0.3
2.1
3.2
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Part 1
​(a) Find the sample mean.
x overbarequals
  
2.28 ​(Round to two decimal places as​ needed.)
Part 2
​(b) Find the sample standard deviation.
sequals
  
enter your response here ​(Round to two decimal places as​ needed.)