Please help me thanks so much

An electronics store makes a profit of $30 for every portable DVD player sold and $60 for every DVD recorder sold. The manager’s

USPshnik [31]

It's c or d but leaning more to c

6 0

4 years ago

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On the package for a certain brand of spinach seeds there is a guarantee that, if the printed instructions are followed, of plan

kirill115 [55]

The question is incomplete. Here is the complete question.

On the package for a certain brand of spinach seeds there is a guarantee that, if the printed instructions are followed, 63% of planted seeds will germinate. A random sample of 9 seeds is chosen. If these seeds are planted according to the instructions, find the probability that 4 or 5 of them germinate. Do not round your intermiediate computations, and round your answer to three decimal places.

Answer: P(4<X<5) = 0.624

Step-by-step explanation: The probability of a seed germinate is a <u>Binomial</u> <u>Distribution</u>, i.e., a discrete probability distribution of the number of successes in a sequence of n independents experiments.

This distribution can be approximated to normal distribution by determining the values of mean and standard deviation population:

$\mu=np$

$\sigma=\sqrt{np(1-p)}$

where

n is the sample quantity

p is proportion of successes

For the spinach seeds:

Mean is

$\mu=9(0.65)$

$\mu=$ 5.85

Standard deviation is

$\sigma=\sqrt{9.0.65(1-0.65)}$

$\sigma=$ 1.431

Now, use

$z=\frac{x-\mu}{\sigma}$

to convert into a standard normal distribution.

The probability we want is between 2 values: P(4<X<5).

Therefore, we have to convert those two values:

For X = 4:

$z=\frac{4-5.85}{1.431}$

z = -1.29

For X = 5:

$z=\frac{5-5.85}{1.431}$

z = -0.59

Using z-table:

P(X>4) = 1 - P(z< -1.29) = 0.9015

P(X<5) = P(z< -0.59) = 0.2776

The probability will be

P(4<X<5) = P(X>4) - P(X<5)

P(4<X<5) = 0.9015 - 0.2776

P(4<X<5) = 0.624

The probability of 4 or 5 seeds germinate is 0.624.

6 0

3 years ago

The circumference of the circle shown below is 42 centimeters. Which

Ede4ka [16]

Answer:

It is answer B (125 / 360) * 42

Step-by-step explanation:

3 0

3 years ago

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when graphed on a coordinate plane, Bumby avenue can be represented by the equation y=-4x-7. Primrose Avenue can be represented

erastova [34]

Answer:

Bumby Avenue is represented by the line:

y = -4*x - 7.

Primrose Avenue can be represented with:

8x + 2y = 17.

We may want to find the point where both avenues intersect.

Let's isolate y in this second equation:

2y = 17 - 8x

y = 17/2 - 8x/2 = -4*x + 17/2

Now we can see that the equation for Primrose Avenue has the same slope than the equation for Bumby Avenue, and when two linear equations have the same slope, means that the lines are parallel.

Then we can conclude that Primrose Avenue and Bumby Avenue are parallel, so they never meet eachother.

7 0

3 years ago

You want to draft a four player tennis team. There are eight players to choose from. How many different teams can you form?

Butoxors [25]

We want to make a 4 players team, and there are total 8 players. As we know the order of selection does not matter in a team of players, only the combination of players matters.

So we would use concept of Combinations and It will be choose 4 out of 8 players.

The formula for Combination is given as follows :-

$nCr = \frac{n!}{r!*(n-r)!} \\\\
Choose \;4 \;out \;of \;8 \;players \\\\
8C4 = \frac{8!}{4!*(8-4)!} = \frac{8!}{4!*4!} \\\\
8C4 = \frac{8*7*6*5*4*3*2*1}{(4*3*2*1)*(4*3*2*1)} = \frac{8*7*6*5}{4*3*2*1} =\frac{1,680}{24} = 70 \;combinations$

Hence, Total number of different teams = 70 combinations.

4 0

3 years ago