Mr. Jefferson's and Mr. Hamilton's fifth grade classes sold brownies every day at school for 6 months. If

Mathematics

1 answer:

agasfer [191]2 years ago

5 0

Answer:

It is B

Step-by-step explanation:

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A rare form of malignant tumor occurs in 11 children in a million, so its probability is 0.000011. Four cases of this tumor occ

Shkiper50 [21]

Answer:

a) The mean number of cases is 0.14608 cases.

b) The probability that the number of cases is exactly 0 or 1 is 0.990.

c) The probability of more than one case is 0.010

d) No, because the probability of more than one case is very small

Step-by-step explanation:

We can model this problem with a Poisson distribution, with parameter:

$\lambda=r*t=0.000011*13,280=0.14608$

a) The mean amount of cases is equal to the parameter λ=0.14608.

b) The probability of having 0 or 1 cases is:

$P(k=0)=\frac{\lambda^0 e^{-\lambda}}{0!}=\frac{1*0.864}{1} =0.864\\\\ P(k=1)=\frac{\lambda^1 e^{-\lambda}}{0!}=\frac{0.14608*0.864}{1} =0.126\\\\P(k\leq1)=0.864+0.126=0.990$

c) The probability of more than one case is:

$P(k>1)=1-P(k\leq 1)=1-0.990=0.010$

d) The cluster of 4 cases can not be due to pure chance, as it is a very high proportion of cases according to the average rate. Just having more than one case has a probability of 1%.

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3 years ago

Sqrt(x)-5.5 when x=16

DochEvi [55]

Sqrt(16) = 4 because 4^2 = 16 ;
Then, 4 - 5.5 = -1.5 ;

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2 years ago

If the distance to the park is 2.25 kilometers and dave's rate is 0.15 kilometers per minute, how many minutes will it rake dave

gogolik [260]

The park is 2.25 km away, and Dave can travel .15 km per minute. Divide 2.25 by .15 to get how many minutes it will take him to get to the park. 2.25/.15 = 15. It will take Dave 15 minutes to get to the park.

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3 years ago

Two angles of a quadrilateral are of measures 75° and 117° respectively and the other two angles are equal find the measure of e

insens350 [35]

<u>Answer:</u>

<u>Step-by-step explanation:</u>

The sum of interior angles of a quadrilateral is 360°.

If we consider the measure of one of the unknown angles to be $x$ °, we can set up the following equation: