Last month, 4 customers of Macland Automotive bought the extended service plan with their purchase of a new car. All of their credit scores are given below. Calculate the standard deviation of this population data. Round your answer to 2 places after the decimal point, if necessary.
standard deviation =
| x |
|---|
| 758.9 |
| 781.7 |
| 740 |
| 759.4 |
standard deviation =