The lengths (
) in centimetres of
copper pipes at a local building supplier were measured. The results are listed in the table below.
Write down the mode.
Using your graphic display calculator, write down the value of
(i) the mean;
(ii) the standard deviation;
(iii) the median.
Find the interquartile range.
Draw a box and whisker diagram for this data, on graph paper, using a scale of
Sam estimated the value of the mean of the measured lengths to be
Find the percentage error of Sam’s estimated mean.
1. Vertical line test