There are 12 birds sitting on a wire. Four-sixths of the birds are black. How many black birds are sitting on the wire?
1 answer:
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Answer: Option 'd' is correct.
Step-by-step explanation:
Since we have given that
Margin of error = 0.5 years
Standard deviation = 5
At 90% confidence, z = 1.645
We need to find the minimum size of the sample they must take.
So,
Hence, Option 'd' is correct.
Answer:
∠ A ≈ 44.42°
Step-by-step explanation:
Using the cosine ratio in the right triangle
cos A = =
=
, then
∠ A = (
) ≈ 44.42° ( to the nearest hundredth )