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pochemuha
3 years ago
15

Expanded form for 23.5

Mathematics
2 answers:
Mrac [35]3 years ago
8 0

23.5 = (2 x 10) + (3 x 1) + (5/10)


Katarina [22]3 years ago
7 0

Find the expanded form. Isolate each number. Remember the place values.

23.5 = 20 + 3 + 0.5

20 + 3 + 0.5 is your answer

hope this helps

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A researcher believes that the mean weight of competitive runners is about 140 pounds. A sample of 24 elite distance runners has
ExtremeBDS [4]

Answer:

t=\frac{136-140}{\frac{11}{\sqrt{24}}}=-1.781    

p_v =P(t_{(23)}  

If we compare the p value and the significance level assumed \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 less than 140 pounds at 5% of signficance.  

Step-by-step explanation:

Data given and notation  

\bar X=136 represent the sample mean

s=11 represent the sample standard deviation

n=24 sample size  

\mu_o =140 represent the value that we want to test

\alpha=0.01 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

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

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is less than 140, the system of hypothesis would be:  

Null hypothesis:\mu \geq 140  

Alternative hypothesis:\mu < 140  

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:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-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:  

t=\frac{136-140}{\frac{11}{\sqrt{24}}}=-1.781    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=24-1=23  

Since is a one left tailed test the p value would be:  

p_v =P(t_{(23)}  

Conclusion  

If we compare the p value and the significance level assumed \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 less than 140 pounds at 5% of signficance.  

4 0
2 years ago
Write two equivalent ratios.
vampirchik [111]

Answer:

4 : [8]

[12]

5: [10]

[15]

Hope this helps

6 0
2 years ago
A salesperson works 40 hours per week at a job where she has two options for being paid.option A is an hourly wage of 23. Option
Advocard [28]
Let's start with option A --> $23 per hour x 40 hours = 23 x 40 = 920 = $920

That means we have to find how many $ x 5% = $920 

We'll call our unknown amount: "B", so B x 0.05 = $920

To find B you have to get ride of everything on its side:
(B x 0.05) / 0.05 = 920 / 0.05 ----> we have to do the same operations on each side.
Now we have B = 920 / 0.05 ----> B = $18,400
The salesperson must sell $18,400 in order to earn the same amount as the first option. 
7 0
3 years ago
Can someone plz help me with this one problem!!!
Ymorist [56]
No i believe but I’m unsure
4 0
2 years ago
Read 2 more answers
HELLPPPP PLEASE <br> I WILLL MARK YOU BRILL
anygoal [31]

Answer:

13

Step-by-step explanation:

71-6=65

65/5=13

therefore the answer is 13

7 0
3 years ago
Read 2 more answers
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