I think yes or no
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No. Frequency is just a measure of "how often". It can be less than, equal to or greater than normal.
Yes. Standard deviation depends entirely upon the distribution; it is a measure of how spread out it is (ie how far from the mean "on average" the data is): the larger it is the more spread out it is, the smaller the less spread out. If every data point was the mean, the standard deviation would be zero!
. Normal refill time is less than 2 seconds.
Less than
No. 6.75 is less than 6.759 which is not less than 6.751 which is less than 6.85.