Time to review: The following table presents the time taken to review articles that were submitted for publication to a particular journal during a recent year. A few articles took longer than 6 months to review; these are omitted from the table. Consider the data to be a population.
00
Number of Articles
48
18
Time (Months)
0-0.9
1.0-1.9
2.0 - 2.9
3.0-3.9
4.0 - 49
5.0 - 5.9
15
20
10
13
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(a) Approximate the variance of the times. Round the answer to at least two decimal places.
The variance is
X
(b) Approximate the standard deviation of the times. Round the answer to at least two decimal places.
The standard deviation is