The data below shows the number of birds spotted by a bird watcher each hour over 10 hours:
7, 11, 14, 3,17, 15, 21, 17, 10, 12
a. Create a cumulative frequency table to represent the data:
Birds Spotted:
Frequency:
Cumulative Frequency:
please help
Start with
7, 18, 32, 35, 52, ...
just keep adding the values.
now read up on the properties of frequency tables.
To create a cumulative frequency table for the given data, you need to follow these steps:
Step 1: Sort the data in ascending order:
3, 7, 10, 11, 12, 14, 15, 17, 17, 21
Step 2: Start by writing down the distinct values (in ascending order) in the "Birds Spotted" column of the table.
Birds Spotted:
3
7
10
11
12
14
15
17
21
Step 3: Calculate the frequency of each distinct value (how many times it appears in the data) and write it in the "Frequency" column.
Birds Spotted:
3
7
10
11
12
14
15
17
21
Frequency:
1
1
1
1
1
1
1
2
1
Step 4: Calculate the cumulative frequency for each value by adding up the frequencies from the previous values (including the current value) and write it in the "Cumulative Frequency" column.
Birds Spotted:
3
7
10
11
12
14
15
17
21
Frequency:
1
1
1
1
1
1
1
2
1
Cumulative Frequency:
1
2
3
4
5
6
7
9
10
So, the cumulative frequency table for the given data would be as follows:
Birds Spotted | Frequency | Cumulative Frequency
------------------------------------------------
3 | 1 | 1
7 | 1 | 2
10 | 1 | 3
11 | 1 | 4
12 | 1 | 5
14 | 1 | 6
15 | 1 | 7
17 | 2 | 9
21 | 1 | 10