Question: (a) The table below summarises the frequency distribution for the life (in hours) of light bulbs. 610-619 620-629 630-639 640-649 Life, (hours) Frequency, (f).

(a) The table below summarises the frequency distribution for the life (in hours) of light bulbs. 610-619 620-629 630-639 640-649 Life, (hours) Frequency, (f). 27 50 90 33 (i) Find an estimate for the MEAN for the data. (ii) Find an estimate for the STANDARD DEVIATION for the data. For part (a) of the question, write your answers to 3 decimal places. (b) University Cabs have a fleet of 6 taxis and they all operate independently. Any one taxi will spend 60% of the time waiting for a call. (i) What is the probability of there being 2 taxis waiting for a call? (ii) What is the probability of there being 4 or more taxis waiting for a call? For part (b) of the question, write your answers to 4 decimal places.

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