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2 years ago

Just do 11 or 12 or both please im really tired and it 1:34 in the morning plz help

Mathematics

1 answer:

kumpel [21]2 years ago

3 0

Answer:

11)(-1)

12)1.7

Step-by-step explanation:

11)y+z/x

(-3)+(-2)/5

(-5)/5

 (-1)

12)x-5z/y

5+5(-2)/(-3)

5+(-10)/(-3)

(-5)/(-3)

1.666

1.7

Hope this helps you

If you have any question just ask me

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The number of "destination weddings" has skyrocketed in recent years. For example, many couples are opting to have their wedding

melamori03 [73]

Answer:

We conclude that the mean wedding cost is less than $30,000 as advertised.

Step-by-step explanation:

We are given the following data set:(in thousands)

29100, 28500, 28800, 29400, 29800, 29800, 30100, 30600

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{236100}{8} = 29512.5$

Sum of squares of differences = 3408750

$S.D = \sqrt{\frac{3408750}{7}} = 697.82$

Population mean, μ = $30,000

Sample mean, $\bar{x}$ = $29512.5

Sample size, n = 8

Alpha, α = 0.05

Sample standard deviation, s = $ 697.82

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 30000\text{ dollars}\\H_A: \mu < 30000\text{ dollars}$ We use one-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{29512.5 - 30000}{\frac{697.82}{\sqrt{8}} } = -1.975$

Now,

$t_{critical} \text{ at 0.05 level of significance, 7 degree of freedom } = -1.894$

Since,

$t_{stat} < t_{critical}$

We fail to accept the null hypothesis and reject it.

We conclude that the mean wedding cost is less than $30,000 as advertised.

8 0

3 years ago

Andre cycled a distance 25km in 150 minutes. What was his average speed (km/h)?

FrozenT [24]

Answer:

10 km/h

Step-by-step explanation:

First, convert 150 minutes to hours:

150/60

= 2.5 hours

Then, to find his speed, divide the km by the number of hours:

25/2.5

= 10 km/h

6 0

3 years ago

Read 2 more answers

A large population of variable x is characterized by its known mean value of 6.1 units and a standard deviation of 1.0 units and

scoundrel [369]

Answer:

-6.134 to +6.134

Step-by-step explanation:

given that a large population of variable x is characterized by its known mean value of 6.1 units and a standard deviation of 1.0 units and a normal distribution

X is Normal with mean =6.1 and std dev = 1 unit

We are to determine the range of values containing 70% of the population of x

We know that normal distribution curve is bell shaped symmetrical about the mean.

So to find 70% range we can use 35% on either side of the mean

Using std normal distribution table the value of z for which probability from 0 to z is 0.35 is 1.034

Hence corresponding x value is

$x=6.1+1.034*1\\x=6.134$

i.e. 70% values lie between

-6.134 to +6.134

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3 years ago

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Joe runs 9.25 times around a track in 1, 125.803 seconds. If one lap around the track is 502.3 meters,

musickatia [10]

Step-by-step explanation:

Speed = Distance÷Time

502.3÷125.803= 3.99275057

6 0

3 years ago

I have two questions?

Artyom0805 [142]

3n/7=24 multiply both sides by 7

3n=168 divide both sides by 3

n=56

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Personally, learning the material in any way possible is a good thing to me.

4 0

3 years ago