Two Way Tables Two-Way Tables Two-way tables are

Two Way Tables Two-Way Tables Two-way tables are

Two Way Tables Two-Way Tables Two-way tables are useful for displaying data in a clear and concise form. In June 6 people went to France, 18 went to Holland and 5 went elsewhere. In July 10 people went to France, 19 went to Holland and 2 went elsewhere. In August 15 people went to France, 15 people went to Holland and 10 went elsewhere. The information given above becomes much clearer if it is placed in a two-way table. June July August Total Franc e 6 Holland Elsewhere Total 18 5 29 10 15 19 15 2 10 31 40 31

52 17 100 Use the information in the table to answer the following: June July August Total Franc e 6 Holland Elsewhere Total 18 5 29 10 15 19 15 2 10 31 40 31 52 17 100

Completing 1 1. How many people visited Holland in July? 19 2. How many people visited France in August? 15 3. How many people went on holiday in June? 29 4. How many people went to Holland? 52 5. How many people did not visit France or Holland? 17 80 people were asked which one of three TV Channels they preferred to watch. Complete the partially filled two-way table below. Male Female Total BBC 1 ITV 8 5 CH 4 Total 7 20

Completing 2 12 28 20 60 20 80 33 27 Some college students were asked to choose which of the three subjects, English, maths or science they enjoyed most. Complete the two-table below. Girls Boys Total English Maths Sci Total 20 13 17 50 Completing 3 23 15 18 38

28 40 56 106 You can use two-way tables to help solve probability problems: June July August Total Franc e 6 Holland Elsewhere 18 5 10 19 21 Probability 15 15 10 31 52 17 Total 29 31 40 100 What is the probability that a person selected at random: 1. Went to Holland on holiday? 52/100

2. Went on holiday in July? 31/100 3. Went to France in August? 15/100 4. Did not visit either France or Holland? 17/100 5. Went on holiday in June? 29/100 80 people were asked which one of three TV Channels they preferred to watch. The results are given in the two-way table below. BBC 1 ITV CH 4 Total Male 8 5 7 20 Female 12 Total 20 Probability 28

20 2 33 27 60 80 What is the probability that a person selected at random: 1. Preferred BBC 1? 20/80 2. Preferred channel 4? 27/80 3. Was a male? 20/80 4. Was a female? 60/80 5. Was a male who preferred ITV? 5/80 Some college students were asked to choose which of the three subjects, English, maths or science they enjoyed most. The information is displayed in the two-way table below. English Maths Sci Total Girls 20 13

17 50 Boys 18 Total 38 23 15 Probability 3 28 40 56 106 What is the probability that a person selected at random: 1. Chose science as their favourite subject? 40/106 2. Chose English as their favourite subject? 38/106 3. Was a boy? 56/106 4. Was a girl whos favourite subject was English? 20/106 5. Was a boy whos favourite subject was maths? 15/106

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