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fgiga [73]
3 years ago
5

Find the area of a regular decagon with radius 4 cm

Mathematics
2 answers:
bazaltina [42]3 years ago
8 0
A =  \frac{5}{2}t^{2} \sqrt{5 + 2 \sqrt{5} }

A =  \frac{5}{2} (4)^{2}  \sqrt{5 + 2(2.236067978)} }

A =  \frac{5}{2} (16) \sqrt{5 + 4.472135956}

A =  40 \sqrt{9.472135956}

A = 40(3.077683537)

A = 123.1073415cm^{2}

emmasim [6.3K]3 years ago
5 0

The area is 123.1073415 cm
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The monthly worldwide average number of airplane crashes of commercial airlines is 3.5. What is the probabil- ity that there wil
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Answer:

Step-by-step explanation:

We would apply the formula for poisson distribution which is expressed as

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Where

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From the information given,

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a)

For the probability that there will be at least 2 such accidents in the next month, it is expressed as

P(x ≥ 2) = 1 - P(x < 2)

P(x < 2) = P(x = 0) + P(x = 1)

Therefore,

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P(x = 0) = (e^- 3.5 × 1)/1

P(x = 0) = 0.03

P(x = 1) = (e^- 3.5 × 3.5^1)/1!

P(x = 1) = (e^- 3.5 × 3.5)/1

P(x = 1) = 0.11

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b)

For the probability that there will be at most 1 accident in the next month, it is expressed as

P(x ≤ 1) = P(x = 0) + P(x = 1)

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3 years ago
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