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Mekhanik [1.2K]
3 years ago
6

Help plz really plzz

Mathematics
2 answers:
Delicious77 [7]3 years ago
5 0
1) Everything multiplied by 1 will equal itself, same with division.
So, the answer is 156.

2) 15.6

3) 1.56
MAXImum [283]3 years ago
4 0
1. 156
2. 15.6
3. 1.56 

You just move the decimal point in depending on the number or zeros.
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The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to in
oksano4ka [1.4K]

Answer:

Null hypothesis:\mu \leq 8000  

Alternative hypothesis:\mu > 8000  

z=\frac{8300-8000}{\frac{1200}{\sqrt{64}}}=2  

p_v =P(Z>2)=0.0228  

Step-by-step explanation:

1) Data given and notation  

\bar X=8300 represent the sample mean  

\sigma=1200 represent the population standard deviation  

n=64 sample size  

\mu_o =800 represent the value that we want to test  

\alpha represent the significance level for the hypothesis test.  

z would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

2) State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is higher than 8000, the system of hypothesis are :  

Null hypothesis:\mu \leq 8000  

Alternative hypothesis:\mu > 8000  

Since we know the population deviation, is better apply a z 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".  

3) Calculate the statistic  

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

z=\frac{8300-8000}{\frac{1200}{\sqrt{64}}}=2  

4) P-value  

Since is a one-side upper test the p value would given by:  

p_v =P(Z>2)=0.0228  

5) Conclusion  

If we compare the p value and the significance level assumed, for example \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the mean is significantly higher than $8000.  

4 0
3 years ago
Which of the following describes the correct process for solving the equation 2x + 6 = 22 and arrives at the correct solution?
gulaghasi [49]

Answer:A

Step-by-step explanation:

we need to first find the answer to the equation.

2x+6=22

6-6=0

22-6=16

2x=16

divide both sides by 2

x=8

4 0
3 years ago
Read 2 more answers
Find the least number must be added to 4015 to make it a perfect square. also,find the square root of the perfect square so obta
Vladimir [108]

To solve this, I used guess and check.

I started by finding 60²=3600 and 70²=4900. 70² is too much, so I then did 65²=4,225.

After 65², I did 62²=3,844. I knew that was pretty close, so I did 64. 64²=4,096 and 63²=3,969. So, 64² was it.

4,096-4015=81

So, you would need to add 81 to 4015 in order to receive a perfect square, which is 64²(4,096).

7 0
3 years ago
" A projectile is launched in the air according to the equation h(t)= -16t^2 + 125t + 5. At what time does the projectile land?"
Vlad1618 [11]
"according to the equation is a sloppy description, and announces that whoever said it or wrote it doesn't really have a clue to what the equation means or what it's good for.

h (t) is the HEIGHT of the projectile above the ground at any time 't'. When the projectile hits the ground, h (t) is zero. Write that ! Then you have a quadratic equation that you can easily solve for 't'.
8 0
3 years ago
Megan took a cab ride and was charged a fare of $1.50 per mile and an additional charge of $5 for her luggage. If Megan traveled
____ [38]
For example let's say Megan has to pay the cab driver $50. Here's the equation 50=1.50x + 5 First you want to get x by itself on one side. So subtract 5 on both sides 50=1.50x + 5 -5 -5 --------------------------- 45=1.50x Now that you have x on one side; however, you want to divide to get the answer. 45=1.50x ----------------------- 1.50 x = 30 So if Megan pay $50 that mean she rode 30 miles ~by the way I'm sorry if you are looking at the answers and it isn't in the right place, I'm answering this on a tablet~
7 0
3 years ago
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