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3 years ago

2 Find the radius and diameter of a circle of area:a) 6.16 cm²b) 13.86 cm²

Mathematics

1 answer:

Marrrta [24]3 years ago

6 0

Answer:

Area = 6.16cm^2

by using Formula,

A=πr^2

6.16=3.14*r^2

r=1.4cm

now,

D=2*r

=2*1.4

=2.8 CM

A=13.86

now,

A=πr^2

13.86=3.14*r*r

4.41=r^2

r=2.1

D=2.1*2

=4.2 cm

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3 years ago

At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population pro

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Answer:

A sample of 1068 is needed.

Step-by-step explanation:

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In which

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We need a sample of n.

n is found when M = 0.03.

We have no prior estimate of $\pi$ , so we use the worst case scenario, which is $\pi = 0.5$

Then

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3 years ago

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4 years ago

Read 2 more answers

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arlik [135]

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3 years ago

2 Find the radius and diameter of a circle of area:a) 6.16 cm²b) 13.86 cm²​

2 Find the radius and diameter of a circle of area:a) 6.16 cm²b) 13.86 cm²