Answer:
3.175 s
0.221735578261 s
0.11086778913 s
Explanation:
Mean is given by
[tex]t=\dfrac{3.3+3.4+3.1+2.9}{4}\\\Rightarrow t=3.175\ s[/tex]
The mean is 3.175 s
Standard deviation is given by
[tex]s=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\bar{x})^2}[/tex]
[tex]s=\sqrt{\dfrac{(3.3-3.175)^2+(3.4-3.175)^2+(3.1-3.175)^2+(2.9-3.175)^2}{4-1}}\\\Rightarrow s=0.221735578261\ s[/tex]
The standard deviation is 0.221735578261 s
Standard error is given by
[tex]\sigma_x=\dfrac{s}{\sqrt{N}}\\\Rightarrow \sigma_x=\dfrac{0.221735578261}{\sqrt{4}}\\\Rightarrow \sigma_x=0.11086778913\ s[/tex]
The standard error is 0.11086778913 s
Checked in excel
