Question

A survey of birds in Forests A and B counted the number of robins and sparrows. Use the resulting frequency table to find each percentage.

Robins Sparrows Totals
Forest A 9 16 25
Forest B 36 64 100
Totals 45 80 125

percent of birds in Forest B that are robins =
%

percent of sparrows that are in Forest A =
%

percent of birds that are in Forest A =
%

Answer 1

36%

20%

20%

Explanation:

Percentage of birds in Forest B that are robins :

No. of robins in Forest B / birds in Forest B

36 / 100

0.36

36%

Percentage of sparrows that are in Forest A :

Sparrows in Forest A / total sparrows

16 / 80

0.2

20%

Percentage of birds in Forest A :

Birds in Forest A / Total birds

25 / 125

0.2

20%

Answer 2

1. 36%
2. 20%
3. 20%

Explanation:

Percentage of birds in Forest B that are robins :

• No. of robins in Forest B / birds in Forest B
• 36 / 100
• 0.36
• 36%

Percentage of sparrows that are in Forest A :

• Sparrows in Forest A / total sparrows
• 16 / 80
• 0.2
• 20%

Percentage of birds in Forest A :

• Birds in Forest A / Total birds
• 25 / 125
• 0.2
• 20%