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Give two reasons why caches are useful. what problem do they solve?
1.fast data processing 2.fast data retrieval
What is a bimodal data set?
A bi-modal data set is a data set that has two modes. In the data set 1, 2, 2, 3, 4, 4, 5 the mode is 2 AND 4. So it is a bi-modal data set. Hope that helps.
Can the median answer be a decimals like 5.5?
Yes.Two ways:the data contains non-integer items, eg the median of {1, 1.3, 1.567, 2.4, 5} is 1.567;the data contains an even number of data items. In this case, the median is the mean average of the middle two, which may not be an integer, eg the median of {1, 2, 3, 4} is the mean average of {2, 3} = (2+3)/2 = 2.5
How do you work out speed using mean and median?
Mean is the average of a set of data points = (Sum of all data) / Quantity of DataMedian is the middle of a set of data points = Data whose index is the integer nearest ((Number of Data+1) / 2)Example Data:2, 3, 5, 3, 2The mean = (2+3+5+3+2)/5 = 15/5 = 3The median = Index((5+1)/2) = Index(6/2) = Index(3). The third item on our list is 5.
Explain how graphs are used and what their advantages are?
Graphs give a very rapid visual of trends that may exist in data. This trend may be observed and formulae may be derived based on proportionality of 2 variables (one being controlled at a time)
