Answer:
The correct option is A.
Step-by-step explanation:
The given data is
7, 3, 4, 2, 5, 6, 9
The mean of the data is
[tex]\bar{x}=\frac{\sum{x}}{n}=\frac{36}{7}=5.142857[/tex]
The standard deviation of the data is
[tex]\sigma=\sqrt{\frac{\sum{(x-\bar{x})^2}}{n-1}[/tex]
Using the below table put the values in the above formula,
[tex]\sigma=\sqrt{\frac{34.85714}{7-1}[/tex]
[tex]\sigma=\sqrt{5.80952381}[/tex]
[tex]\sigma=2.410295378[/tex]
[tex]\sigma\approx 2.4[/tex]
Therefore the correct option is A.
