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2 years ago

Can someone please help me ‍♂️

Mathematics

2 answers:

Gekata [30.6K]2 years ago

8 0

A=pir^2
Pi(9)^2
Equals 81 pi
If 81 pi is the whole circle which is 360 then what is 120
120 times 3 =369
So 81/3

Answer 27pi.

A is the answer

klasskru [66]2 years ago

6 0

Well 120 is 1/3 of the square so the 9ft is 2/3 of the square so it is B

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Answer:

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Step-by-step explanation:

a/3 + a/3 + a/3

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3 years ago

The number of typographical errors on a page of the first booklet is a Poisson random variable with mean 0.2. The number of typo

muminat

Answer:

The required probability is 0.55404.

Step-by-step explanation:

Consider the provided information.

The number of typographical errors on a page of the first booklet is a Poisson random variable with mean 0.2. The number of typographical errors on a page of second booklet is a Poisson random variable with mean 0.3.

Average error for 7 pages booklet and 5 pages booklet series is:

λ = 0.2×7 + 0.3×5 = 2.9

According to Poisson distribution: $P(k{\text{ events in interval}})={\frac {\lambda ^{k}e^{-\lambda }}{k!}}$

Where $\lambda$ is average number of events.

The probability of more than 2 typographical errors in the two booklets in total is:

$P(k > 2)= 1 - {P(k = 0) + P(k = 1) + P(k = 2)}$

Substitute the respective values in the above formula.

$P(k > 2)= 1 - ({\frac {2.9 ^{0}e^{-2.9}}{0!}} + \frac {2.9 ^{1}e^{-2.9}}{1!}} + \frac {2.9 ^{2}e^{-2.9}}{2!}})$

$P(k > 2)= 1 - (0.44596)$

$P(k > 2)=0.55404$

Hence, the required probability is 0.55404.

4 0

2 years ago

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For easier calculation,
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1 unit=56/4
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