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guajiro [1.7K]
3 years ago
10

Today, there were 2 members absent from the band. The present members folded 25 programs each, for a total of 525 programs.

Mathematics
2 answers:
timurjin [86]3 years ago
7 0

Answer: C:How many members are in the band when no one is absent.

Step-by-step explanation:

this is the answer for khan academy .i just got the answer wrong and looked at which one was right

svlad2 [7]3 years ago
6 0

Answer:

c

Step-by-step explanation:

khan academy

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An industrial expert claims that the average useful lifetime of a typical car transimssion which comes with ten years warranty i
lesya692 [45]

Answer:

a. none of these answers

Data provides sufficient evidence, at 1% significance level, to support the expert's claim. In addition the p-value (or the observed significance level) is equal to P( T >3.281)

Step-by-step explanation:

Data given and notation  

\bar X=13.5 represent the mean height for the sample  

s=3.2 represent the sample standard deviation for the sample  

n=9 sample size  

\mu_o =10 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 higher than 10 years, the system of hypothesis would be:  

Null hypothesis:\mu \leq 10  

Alternative hypothesis:\mu > 10  

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{13.5-10}{\frac{3.2}{\sqrt{9}}}=3.28    

P-value

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

df=n-1=9-1=8  

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

p_v =P(t_{(8)}>3.281)=0.00558  

Conclusion  

If we compare the p value and the significance level given \alpha=0.01 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can't conclude that we have a mean higher than 10 years at 1% of significance.  

a. none of these answers

3 0
3 years ago
3. Use compass and straightedge to bisect T. Describe your process carefully and clearly.
Reptile [31]
Check the picture attached

let the rays forming angle T be ray 1 and ray 2

Draw a circle with center point T. Let the intersection of the circle with rays 1 and 2 be at points A and B respectively.

Draw 2 circles with centers A and <span>B so that:

The radii (radius'es) are equal, and they are large enough to intersect.

Denote the intersection of these 2 circles with C.

Join T to C. The line through T and C is the bisector.</span>

3 0
3 years ago
Helppppp plzzzzz 10points
wel

I think it should be B because the depth of the water should be decreasing slowing at the same rate.


4 0
3 years ago
Read 2 more answers
5. Algebra Write an expression you can
AveGali [126]

Answer:

y=x^3

Step-by-step explanation:

I don't know y sha

6 0
3 years ago
A store uses the expression -2p+ 50 to model the number of backpacks it sells per day, where the price, p, can be anywhere
Ivan

Answer:

B: $12.00 per backpack gives the maximum revenue; the maximum revenue is $312.00.

Step-by-step explanation:

3 0
3 years ago
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