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3 years ago

Which is an x-intercept of the graphed function? O (0,4) O(-1,0) O (4, 0) O (0,-1)

Mathematics

1 answer:

dolphi86 [110]3 years ago

3 0

Answer:

(x, y)

(-1,0)

since the rest of the points aren't in the multiple choice well it's (-1,0)

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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) $P(13.848$ Step-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:

$P(3.462*4 < 4S^2 < 4*10.745)= P(13.848< \chi^2$ And we can find this probability like this: $P(13.848$ And 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

3 years ago

Yoko, trey, and alan have a total of $115 in their wallets. Alan has 3 times what Yoko has. Yoko has $5 less than Trey. How much

andriy [413]

Answer:

Yoko has $22, Alan has $66, and Trey has $27

Step-by-step explanation:

Let x represent how much money Yoko has.

Alan has 3 times as much as Yoko, so his amount can be represented by 3x.

Trey has $5 more than Yoko, so his amount can be represented by x + 5.

Add these together and set them equal to 115. Then, solve for x:

(x) + (3x) + (x + 5) = 115

5x + 5 = 115

5x = 110

x = 22

So, Yoko has $22.

Alan has 3 times as much, so multiply this by 3:

22(3) = 66

Alan has $66.

Yoko has $5 less than Trey, so add 5 to this:

22 + 5 = 27

Trey has $27.

Yoko has $22, Alan has $66, and Trey has $27

4 0

3 years ago

1. Name a pair of vertical angles.

Goryan [66]

1)b and f, a and d

2)c and d

3)d and f

4 0

3 years ago

5 weeks to 40 Days ratio as a fraction in simplest form

leva [86]

So it would look like 5/40 but both sides can be divided but 5 so it would be 1/8

8 0

4 years ago

Read 2 more answers

WILL MARK!! pls help:) <br> Find x and y so that ABCD will be a parallelogram.

sladkih [1.3K]

Answer:

your answer will be B. 46

Step-by-step explanation:

hope it helps you...

have a great day!!!

8 0

3 years ago