Looking at Frequency Tables


1. Put 1 green marble, 1 blue marble and 2 red marbles into a bag. Pick 1 marble out and record the result. Pick 10 times. Keep a record of the outcomes. Put your results together with the results of 9 other people so that you can see the results of 100 picks. Put your answers in a frequency table like this one.


Colour


Green Blue Red


Based on your results, you would say: a) The chances of picking a green marble = ___


b) The chances of picking a blue marble = ___ c) The chances of picking a red marble = ___


100 = % 100 = % 100 = %


d) Based on the number of marbles in the bag, is this what you would have expected? If it isn’t, what would you have expected?


2. Now look at this frequency table, which shows the number of times coloured cubes were picked from a bag.


Colour Yellow Pink


White


Frequency 22 9


19


a) Based on the frequency with which each colour was picked, what are the percentage chances of each colour being picked?


Yellow = 22


__ 50 = % Pink = 9


__ 50 = % White = 19


__ 50 = %


b) If there are 5 cubes in the bag, how many cubes of each different colour are likely to be in the bag?


Number of times picked (frequency)


Chance


83


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