The sample scores given below are times (in milliseconds) it took the author's disk drive to make one revolution. The times were recorded by a diagnostic software program.

a. Find the mean of the times in this sample.
b. Find the median of the times in this sample.
c. Find the mode of the times in this sample.
d. Find the standard deviation σ of this sample.
e. Convert the time of 200.5 ms to a z score.
f. Find the actual percentage of these sample scores that are greater than 201.0 ms.
g. Assuming a normal distribution, find the percentage of population scores greater than 201.0 ms. Use the sample values of and s as estimates of µ, and σ.
h. The specifications require times between 197.0 ms and 202.0 ms. Based on these sample results, does the disk drive seem to be rotating at acceptable speeds?

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