Answer:

Thus the median does not use all the information in the data and so it can be shown to be less efficient than the mean or average, which does use all values of the data. To calculate the mean we add up the observed values and divide by the number of them. The total of the values obtained in Table 1.1 was 22.5

which was divided by their number, 15, to give a mean of 1.5.

Step-by-step explanation:

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