All categories

3 years ago

Help :( ik I asked a questions a few mins ago my brain just isn’t it today

Mathematics

1 answer:

ELEN [110]3 years ago

7 0

I can’t see your scream is crack

You might be interested in

after 1 year, Fantasy island had 3,500 visitors. after 5 years, fantasy island had 9,500 visitors. Write an equation that descri

nexus9112 [7]

Answer: 1 year = 1200

Y x 1200 = The visitors

(Y= Years/time)

Step-by-step explanation:

5 0

3 years ago

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the te

vredina [299]

Answer:

b. 2.333

Step-by-step explanation:

Test if the mean transaction time exceeds 60 seconds.

At the null hypothesis, we test if the mean transaction time is of 60 seconds, that is:

$H_0: \mu = 60$

At the alternate hypothesis, we test if it exceeds, that is:

$H_1: \mu > 60$

The test statistic is:

$t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, s is the standard deviation of the sample and n is the size of the sample.

60 is tested at the null hypothesis:

This means that $\mu = 60$

A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds.

This means that $n = 16, X = 67, s = 12$

Value of the test statistic:

$t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}$

$t = \frac{67 - 60}{\frac{12}{\sqrt{16}}}$

$t = \frac{7}{3}$

$t = 2.333$

Thus, the correct answer is given by option b.

5 0

3 years ago

The equation of a parabola is (y−3)2=20(x+1) .

True [87]

ANSWER

$x = - 6$

EXPLANATION

The given parabola has equation:

${(y - 3)}^{2} = 20 {(x + 1)}^{2}$

This parabola opens in the direction of the positive x-axis.

This can be rewritten as:

${(y - 3)}^{2} = 4(5) {(x + 1)}^{2}$

The vertex is (-1,3)

The directrix of this parabola is

$x = - 1 - 5$

$x = - 6$

6 0

3 years ago

Read 2 more answers

If a man weighs 185 pounds, and 60% of his body weight is water, how many pounds of water does he have?

Kitty [74]

Answer:

111 lbs

Step-by-step explanation:

6 0

3 years ago

We roll a pair dice 10,000 times. Estimate the probability that the number of times we get snake eyes (two ones) is between 280

Natali5045456 [20]

Answer:

0.3573 = 35.7%

Step-by-step explanation:

We roll a pair of dice 10,000 times so the mean and standard deviation is,

μ = 10000/36 =277.7 σ = $\sqrt{10000*\frac{35}{36^{2} } } =16.4$

$z_{1}$ = (280 - 277.7)/16.4 = .14

$z_{2}$ = (300 - 277.7)/16.4 = 1.35

Probablity (range)

0.3573

Z(low)=0.14 0.555766357

Z(upper)=1.36 0.91304644

6 0

3 years ago