All categories

3 years ago

Can somebody help me pls

Mathematics

2 answers:

Marat540 [252]3 years ago

4 0

Answer:

Step-by-step explanation:

hope it helps you

tigry1 [53]3 years ago

4 0

Answer:

3 1/2

Step-by-step explanation:

4 3/5-1 1/10

4*5+3/5-1*10+1/10

23/5-11/10 LCD 10

46/10-11/10

35/10

7/2

3 1/2

You might be interested in

Gloria is parking in a garage that charges $3 for the first two hours and $2 per hour for any time after the two hours. What is

nikklg [1K]

It is B. Because the 3$ doesn't have any variables and the 2 dollars is per hours so 2x

6 0

3 years ago

Read 2 more answers

Eight more than four times a number is 28.

Lunna [17]

4x+8=28, therefore it’s B

8 0

3 years ago

When a diagonal is drawn in a rectangle, what is true of the areas of the two triangles into which it divides the rectangle?

netineya [11]

The 2 triangles are equal in area

7 0

3 years ago

Read 2 more answers

What is the volume of the prism below

IceJOKER [234]

Answer:A. 140

Step-by-step explanation:

1/2(5)(7)(8)

5 0

3 years ago

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

4 years ago