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Makovka662 [10]

2 years ago

8

Sharon wants to make key chains with different colored beads. Each key chain will look the same. Sharon will use a total of 20 g

reen beads to make all her key chains. What is the number of red beads and the number of blue beads she will need to make all of the key chains?

2 answers:

skelet666 [1.2K]2 years ago

8 0

20 green and 20 red ?

Archy [21]2 years ago

4 0

Answer:

Step-by-step explanation:

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Tania has a set of nesting rings. This table shows the relationship between the radius of a ring and the ring's circumference.

valentinak56 [21]

Answer:

The circumference is 59.66 cm

Step-by-step explanation:

we know that

The circumference of a circle (ring) is given by the formula

$C=2\pi r$

If the radius is

$r=9.5\ cm$

substitute in the formula

$C=2\pi (9.5)$

$C=19\pi\ cm$ ----> exact value

assume

$\pi =3.14$

substitute

$C=19(3.14)=59.66\ cm$

5 0

2 years ago

A consensus forecast is the average of a large number of individual analysts' forecasts. Suppose the individual forecasts for a

stealth61 [152]

Answer:

a) 0.954

b) 0.937

c) 0.891

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 6 percent

Standard Deviation, σ = 1.3 percent

We are given that the distribution of particular interest rate is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(At least 3.8 percent.)

$P(x \geq 3.8)$

$P( x \geq 3.8) = P( z \geq \displaystyle\frac{3.8 - 6}{1.3}) = P(z > -1.69)$

$= 1 - P(z < -1.69)$

Calculation the value from standard normal z table, we have,

$P(x \geq 3.8) = 1 - 0.046 = 0.954 = 95.4\%$

b) P(At most 8 percent)

$P(x \leq 8) = P(z \leq \displaystyle\frac{8-6}{1.3}) = P(z \leq 1.53)$

Calculating the value from the standard normal table we have,

$P( x \leq 8) =0.937= 93.7\%$

c) P(Between 3.8 percent and 8 percent. )

$P(3.8 \leq x \leq 8) = P(-1.69 \leq z \leq 1.53)\\\\= P(z \leq 1.53) - P(z < -1.69)\\= 0.937 - 0.046 = 0.891 = 89.1\%$

$P(3.8 \leq x \leq 8) = 89.1\%$

3 0

2 years ago

SAT scores of students at an Ivy League college are distributed with a standard deviation of 250 points. Two statistics students

Minchanka [31]

Answer:

The sample size should be 273 students

Step-by-step explanation:

Here Raina wants to use 90% interval then

ME = z. SE

SE = s d/√n at end

ME/z = s d/√n

n={z.sd/ME)²

Z = 1.65 =>due to 90%confidence interval

ME= 24

sd=250

putting these value in the question we get 273 students

8 0

2 years ago

Inquiries arrive at a record message device according to a Poisson process of rate 15 inquiries per minute. The probability that

zloy xaker [14]

Answer:

0.0498 = 4.98%

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

In which

x is the number of sucesses

e = 2.71828 is the Euler number

$\mu$ is the mean in the given time interval.

Inquiries arrive at a record message device according to a Poisson process of rate 15 inquiries per minute.

Each minute has 60 seconds.

So a rate of 1 inquire each 4 seconds.

The probability that it takes more than 12 seconds for the first inquiry to arrive is approximately

Mean of 1 inquire each 4 seconds, so for 12 seconds $\mu = \frac{12}{4} = 3$

This probability is P(X = 0).

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

$P(X = 0) = \frac{e^{-3}*3^{0}}{(0)!} = 0.0498$

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2 years ago

Find the product of 4 5\6 and 2 1\2. Express your answer in simplest form.

dexar [7]

The answer should be B.

3 0

2 years ago

Read 2 more answers