The wait time at a drive-through fast-food restaurant has a standard deviation of 18.0 seconds. Use the following data, which has come from a population that is normally distributed, to decide whether...

The wait time at a drive-through fast-food restaurant has a standard deviation of 18.0 seconds. Use the following data, which has come from a population that is normally distributed, to decide whether the evidence suggests the standard deviation of wait time is less than 18.0 seconds, using an α=0.05 level of significance.

108.5, 80.4, 67.4, 95.5, 58.0, 86.5, 75.9, 70.9, 65.1, 72.0

2A) State the appropriate hypothesis to test & confirm any necessary checks to perform the testing.
2B) Calculate the standard deviation of the data.