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zlopas
2 months ago
6

A biologist is studying the composition of birds on a lake and counts 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons. Fro

m previous studies performed around the same time of the year, she expects 50% of the birds to be ducks, 23% to be geese, 12% to be cranes, 10% to be swans, and 5% to be herons. What are the expected and observed counts? Select one.
Mathematics
1 answer:
babunello [11.8K]2 months ago
7 0

Answer:

Expected counts: 55 ducks, 25 geese, 13 cranes, 11 swans, 6 herons

Observed counts:

61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons.

Step-by-step explanation:

Counting reveals there are 110 birds in total on the lake: 61+17+11+15+6.

The calculated expected counts are:

0.50*110 = 55 ducks

0.23*110 = 25 geese

0.12*110 = 13 cranes

0.10*110 = 11 swans

0.05*110 = 6 herons

What the biologist recorded were the observed counts.

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