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Tanzania [10]
2 years ago
8

Andy claims that his bird can do single-digit multiplication. He shows the bird 12 cards with simple multiplication problems tha

t are either correct or incorrect. The bird correctly identifies the correctness of the card 9 times out of 12. If the bird were simply guessing, how many would the bird be expected to get correct? (1 point)
3
9
6
12
Mathematics
1 answer:
Snowcat [4.5K]2 years ago
6 0
If the bird were just guessing there would be two options (right or wrong) and we would expect them to be equally likely to occur (50% chance for each). A 50% of correct, out of 12 cards gives us:

12×0.50=6

If the bird was guessing we would expect 6 correct answers. (1/2 of the total correct and 1/2 wrong.)

So the answer would be 6.
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Each exterior angle of a regular polygon is 10°. How many sides does it have?
jeka94

Answer:

if exterior angle is 10 degrees, then interior angle is 180 -10 = 170 deg.

Each trinaglke inside the polygon will be isosceles with two angles of 170/2 - 85 degrees each.

So, angle at centre = 180 -170 = 10 deg.

Ttal angle at centre = 360 deg.

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Julli [10]

Answer:

5% increase

Step-by-step explanation:

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Help me plz u will make my day
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K=13

Step-by-step explanation:

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And then, we subtract 12 1/4 with 4, and we get 8 1/4

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6 stuffed animals

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