The standard deviation of the mileage for the sample of convertibles is 1.98977 miles.
Standard deviation is used to determine how the values in a group differs from the mean of the values in the group. It is a measure of variation.
In order to determine the standard deviation, take the following steps:
(25 + 25 + 24 + 21 + 21 + 21 + 20) / 7 =22.43
(25 - 22.43)² = 6.6049
(25 - 22.43)² = 6.6049
(24 - 22.43)² = 2.4649
(21 - 22.43)² = 2.0449
(21 - 22.43)² = 2.0449
(21 - 22.43)² = 2.0449
(20 - 22.43)² = 5.9049
Sum of squared difference = 27.7143
√27.7143 / 7 = 1.98977
To learn more about standard deviation, please check: https://brainly.com/question/12402189
