Q1 Finding the mean, median and mode The table shows the number of siblings of each student in a class of 3D. Calculate the mean, median and modal number of siblings. mean = I:] median = mode [3] The table shows the number of text messages sent in one day by a class of 30 students. Estimate the mean and median number of text messages and identify the modal class. mean = median = modal class = E m c: [3] frequency _ _ _ Give 'your answers to l d.p. .- f Q2 Bulb lifetime A light bulb company produces two types of bulbs. The company claims that type K has a longer ayerage lifetime than type Y. The company tests 163 bulbs of type K and 15D bulbs of type '1' with the following results: type x, E x = 20000 type Y. E y = 1?000 Use this information to calculate estimates of the mean lifetime of type K and type '1' bulbs. Give your answers to the nearest hour. type K mean = a hours type Y mean = hours Is the manufacturer's claim correct? yes no The company produces 5 bulbs of type K for every 3 bulbs of type T. What is the average lifetime of a bulb produced by this company? hours