11 (a) 100 students were each asked how long they spent talking on their mobile phone during one day. The results are summarised in the table. On the axes below, draw a histogram to represent these results. (b) The masses, in grams, of 240 potatoes were found. The cumulative frequency table for these results is shown below. (i) Draw a smooth cumulative frequency curve to illustrate this information. (ii) (a) Find the median. (b) Find the inter-quartile range. (iii) Complete the frequency table below. (iv) A potato with a mass greater than 250 grams is classed as extra large. (a) How many of these potatoes are extra large? (b) Which percentile of the distribution can be used to find this number?