1. Word lengths in newspaper crosswords are summarised in Table 10.16

Calculate the mean, mode, median, mean deviation and standard deviation for this data.

2. Lead levels in blood samples from 50 primary school children (μg/l) are given in Table 10.17

Calculate the mean and median and use the formula to estimate the mode of this data. Calculate the standard deviation and display the data using

(a) A histogram.

(b) A cumulative frequency curve.

3. Calculate the standard deviation of the data set representing the lengths of names for a class of pupils as given in Question 2 of Practice Questions 10.4.

4. Calculate the standard deviation of the data set given in Table 10.14. Consider both ungrouped and grouped data.

Data from Question 2 of Practice Questions 10.4.

The pre-names of pupils in a class were:

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k Word length x Frequency fi 1 2 3 3 4 5 10 46 86 94 78 50 20 12 10 12 45 6 7 8 9 10 11 6789 8 9 10 11 12 13 10 Table 10.16 Word lengths in crosswords