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Artist 52 [7]
3 years ago
9

A bag has red, green, and blue marbles. The probability of selecting a red marble is 1/3 and the probability of selecting a gree

n marble is 2/5, what is the probablility of selecting a blue marble
Mathematics
1 answer:
mr_godi [17]3 years ago
4 0

Answer:

4/15

Step-by-step explanation:

There are red, green and blue marbles in the bag.  The total of all the probabilities of selecting red, green and blue marbles is 1.00, or just 1.

So, to find the probability of selecting a blue marble, we add together 1/3 and 2/5 and subtract the total from 1:

1 - (1/3 + 2/5)

or:

1 - (5/15 + 6/15)

or:

1 - 11/15, or 4/15 (answer)

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Using the z-distribution, it is found that the correct option regarding the question in the problem is given by:

B. No, since the confidence interval includes values less than 50%, his opponent may get more votes.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which:

  • \pi is the sample proportion.
  • z is the critical value.
  • n is the sample size.

In this problem, we have a 95% confidence level, hence\alpha = 0.95, z is the value of Z that has a p-value of \frac{1+0.95}{2} = 0.975, so the critical value is z = 1.96.

In this problem, the parameters are given as follows:

\pi = 0.52, n = 1000

Hence, the bounds are given by:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.52 - 1.96\sqrt{\frac{0.52(0.48)}{1000}} = 0.489

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.52 + 1.96\sqrt{\frac{0.52(0.48)}{1000}} = 0.551

The lower bound is below 0.5, hence option B is correct.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

7 0
2 years ago
Hillary spent 23.45 on new mats for her car. She spent 9.99 on a car wash. How much did she spend on her car?
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Hillary spent 33.44 on her car.
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4 years ago
Which is the rationalized form of the expression sqrtx/sqrtx+sqrt7
ArbitrLikvidat [17]

Answer:

(x - √7*√x) / (x - 7)

Step-by-step explanation:

I suppose your expression is √x / (√x + √7)

(√x * (√x - √7)) / ((√x + √7) * √x - √7)) = (√x * √x - √7 * √x) / (x - 7)

= (x - √7*√x) / (x - 7)

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3 years ago
Fernando has been saving money to buy an e-book reader. A store has just marked down the price of its readers by 40%. Each reade
Amanda [17]

Answer:

$75

Step-by-step explanation:

Remove $25 from $150. (125)

Calculate 40% of 125. (50)

Remove that 40%. (75)

So...

150 - 25 = 125 - 50 = 75

3 0
3 years ago
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Find the probability of drawing an ace and a king in either order
MA_775_DIABLO [31]

Answer:

I think it is 2/4=1/2

Step-by-step explanation:

Let K=king

A=ace

Then you could the pattern KA, AK

So I think it would be 2/4=1/2

If it helped you please give me brainliest

8 0
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