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gayaneshka [121]
3 years ago
14

What is 7,5444+789=?

Mathematics
2 answers:
liraira [26]3 years ago
4 0
The answer would 76233
lisov135 [29]3 years ago
3 0

Answer:

76233

Step-by-step explanation:

Add the numbers together:

75444 + 789 = 76233

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a pumpkin pie is made in a pie pan measuring 9 inches in diameter. it is cut into 8 equal slices. what is the length of the crus
lukranit [14]
The length of the pie is 72
7 0
3 years ago
23. A certain type of gasoline is supposed to have a mean octane rating of at least 90. Suppose measurements are taken on of 5 r
Nostrana [21]

Answer:

a) p_v =P(Z          

b) Since p_v we can reject the null hypothesis at the significance level given. So based on this we can commit type of Error I.

Because Type I error " is the rejection of a true null hypothesis".

c) P(\bar X >90)=1-P(Z

1-P(Z

d) For this case we need a z score that accumulates 0.02 of the area on the right tail and 0.98 on the left tail and this value is z=2.054

And we can use this formula:

2.054=\frac{90-89}{\frac{0.8}{\sqrt{n}}}

And if we solve for n we got:

n = (\frac{2.054 *0.8}{1})^2=2.7 \approx 3

Step-by-step explanation:

Previous concepts  and data given  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

We can calculate the sample mean and deviation with the following formulas:

\bar X = \frac{\sum_{i=1}^n X_i}{n}

s=\sqrt{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}

\bar X=88.96 represent the sample mean    

s=1.011 represent the sample standard deviation  

n=5 represent the sample selected  

\alpha significance level    

State the null and alternative hypotheses.    

We need to conduct a hypothesis in order to check if the mean is less than 90, the system of hypothesis would be:    

Null hypothesis:\mu \geq 90    

Alternative hypothesis:\mu < 90    

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:    

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}  (1)    

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".    

Calculate the statistic  

We can replace in formula (1) the info given like this:    

z=\frac{88.96-90}{\frac{0.8}{\sqrt{5}}}=-2.907      

Part a

P-value  

First we need to calculate the degrees of freedom given by:

df=n-1=5-1 = 4

Then since is a left tailed test the p value would be:    

p_v =P(Z    

Part b

Since p_v we can reject the null hypothesis at the significance level given. So based on this we can commit type of Error I.

Because Type I error " is the rejection of a true null hypothesis".

Part c

We want this probability:

P(\bar X

The best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

If we apply this formula to our probability we got this:

P(\bar X >90)=1-P(Z

1-P(Z

Part d

For this case we need a z score that accumulates 0.02 of the area on the right tail and 0.98 on the left tail and this value is z=2.054

And we can use this formula:

2.054=\frac{90-89}{\frac{0.8}{\sqrt{n}}}

And if we solve for n we got:

n = (\frac{2.054 *0.8}{1})^2=2.7 \approx 3

7 0
3 years ago
Help me please.....​
PolarNik [594]

Answer: I believe its Option 2

Step-by-step explanation: Sory if im wrong

8 0
2 years ago
Read 2 more answers
Which equation is related to the given equation? column a column b 1. 61 + 18 = z 2. z = 61 – 18 3. –18 = 61 – z 4. 18 = 61 – z
Fofino [41]

Question 1.).

Column A.):  

Answer ==>  z  =  61  –   18, is Related to  z  +  18   =  61,   ==>   z    =   43

Answer: ===>  18   =    61    -  z,  is Related to  z    +   18   =  61,   ===>   z   =   43

z      +     18     =   61

Let's solve your equation step-by-step.

z     +     18      =     61

Step 1: Subtract 18 from both sides.

z  +   18   −   18    =     61    −     18

z     =     43

Graph:  ========>   z    +    18     =     61  =========>     z     =======>    43

Column (A),     Answer:     =======>     z     =      43



Question 2.).  

Column. B.):  

Answer: =====>   61 + 18   =   z,  Related to z  - 18  =  61  ====>  z   =   79 Answer: ===>   –18   =   61   –   z,  Related to   z  -   18   =  61  ====>  z  =  79    

z      -     18     =     61

Let's solve your equation step-by-step.

z         −       18        =           61

Step 1: Add 18 to both sides.

z     −     18     +     18     =     61       +        18

z    =       79

   Answer     z     =      79




Therefore, The answers to your Equation: Column (A),/Column (B)

Question 1.).

Column A.):  

Answer ==>  z  =  61  –   18, is Related to  z  +  18   =  61,   ==>   z    =   43

Answer: ===>  18   =    61    -  z,  is Related to  z    +   18   =  61,   ===>   z   =   43



Question 2.).  

Column. B.):  

Answer: =====>   61 + 18   =   z,  Related to z  - 18  =  61  ====>  z   =   79 Answer: ===>   –18   =   61   –   z,  Related to   z  -   18   =  61  ====>  z  =  79  





Hope that helps!!!!!!!!                            : )

7 0
3 years ago
Read 2 more answers
Vă rog rezolvați-mi și mie aceste calcule:<br> Mersii
Akimi4 [234]
Fix you some claculations?
3 0
3 years ago
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