The length of time required for an automobile driver to respond to a particular emergency situation was recorded for n = 10 drivers. The times (in seconds) were .5, .8, 1.1, .7, .6, .9, .7, .8, .7, .8.
a. Scan the data and use the procedure in Section 2.5 to find an approximate value for s. Use this value to check your calculations in part b.
b. Calculate the sample mean  and the standard deviation s. Compare with part a.