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Elenna [48]
3 years ago
6

A box is filled with 10 brown cards , 4 yellow cards, and 4 red cards. A card is chosen at random from the box. What is the prob

ability that the card is not red? Write answer as a fraction in simplest form
Mathematics
1 answer:
Setler [38]3 years ago
5 0
The answer is 2/9

explanation:
10+4+4= 18 cards in the box
and there are 4 red cards in the box, so it’s 4/18. u divide both sides by 2, which gives u the simplest version, 2/9.
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Jamal works as an electrician apprentice he rewired for electrical outlets for electrical outlets in 1 1/2 hours. If it worked a
Nata [24]

Answer:

13

Step-by-step explanation:

they go at diffrent speed of electric.

6 0
2 years ago
Assume the sample variances to be continuous measurements. Find the probability that a random sample of 25observations, from a n
konstantin123 [22]

Answer:

a) P(4S^2 > 4*9.1) = P(\chi^2_{24} >36.4) = 0.0502

b)P(13.848Step-by-step explanation:

Previous concepts

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

For this case we assume that the sample variance is given by S^2 and we select a random sample of size n from a normal population with a population variance \sigma^2. And we define the following statistic:

T = \frac{(n-1) S^2}{\sigma^2}

And the distribution for this statistic is T \sim \chi^2_{n-1}

For this case we know that n =25 and \sigma^2 = 6 so then our statistic would be given by:

\chi^2 = \frac{(n-1)S^2}{\sigma^2}=\frac{24 S^2}{6}= 4S^2

With 25-1 =24 degrees of freedom.

Solution to the problem

Part a

For this case we want this probability:

P(S^2 > 9.1)

And we can multiply the inequality by 4 on both sides and we got:

P(4S^2 > 4*9.1) = P(\chi^2_{24} >36.4) = 0.0502

And we can use the following excel code to find it: "=1-CHISQ.DIST(36.4,24,TRUE)"

Part b

For this case we want this probability:

P(3.462 < S^2

If we multiply the inequality by 4 on all the terms we got:

P(3.462*4 < 4S^2 < 4*10.745)= P(13.848< \chi^2And we can find this probability like this:P(13.848And we use the following code to find the answer in excel: "=CHISQ.DIST(42.98,24,TRUE)-CHISQ.DIST(13.848,24,TRUE)"

8 0
2 years ago
Which expression is NOT equal to 28?
Temka [501]

Answer:

aaaaa

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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aksik [14]

Answer:

8 + y = 3y

8 = 3y - y

8 = 2y

8/2 = y

<h2>4 = y</h2>
8 0
3 years ago
Read 2 more answers
Find the domain -√x-5+10
Ann [662]
0, and Positive infinity is the answer

4 0
3 years ago
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