1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
VladimirAG [237]
2 years ago
9

On Friday,1/6 of band practice was spent trying on uniforms.The band spent 1/4 of practice on marching.The remaining practice ti

me was spent playing music.What fraction of practice time was spent playing mussic?
Mathematics
1 answer:
Salsk061 [2.6K]2 years ago
7 0

I mean I got 5/12 as my simplified answer but I might be wrong. I hope this helps in some way and sorry if I'm wrong

You might be interested in
a Hummer that gets 300 miles on 20 gallons of gas or a Camry that gets 495 miles on 15 gallons of gas
storchak [24]
Camry would be  the better option
5 0
3 years ago
Read 2 more answers
The slope of the tangent line for the curve r=2 cos(3 theta) where theta = pi/6 is.
Phantasy [73]

as you already know, the slope of the tangent line is simply the derivative of the function, so

r=2cos(3\theta )\implies \cfrac{dr}{d\theta }=2\stackrel{chain~rule}{\left[ -sin(3\theta )\cdot 3 \right]} \\\\\\ \left. \cfrac{dr}{d\theta }=-6sin(3\theta ) \right|_{\theta =\frac{\pi }{6}}\implies -6sin\left( 3\cdot \frac{\pi }{6} \right)\implies -6sin\left( \frac{\pi }{2} \right)\implies -6

7 0
2 years ago
Ill give brainliest
Luba_88 [7]
The answer is c. Because 4.5 * 2 is 9 then you add 0.5 so the answer is 9.5
3 0
3 years ago
Read 2 more answers
-b+7c b=2 c=-4<br> What’s the answer
Neko [114]

Answer:

-30

Start with multiplication 7x(-4) will equal -28 then add that to the -2 and you will get -30

8 0
3 years ago
Read 2 more answers
In a random sample of 150 customers of a high-speed Internetprovider, 63 said that their service had been interrupted one ormore
erastovalidia [21]

Answer:

a) The 95% confidence interval would be given by (0.341;0.499)

b) The 99% confidence interval would be given by (0.316;0.524)

c) n=335

d)n=649

Step-by-step explanation:

1) Notation and definitions

X_{IS}=63 number of high speed internet users that had been interrupted one or more times in the past month.

n=150 random sample taken

\hat p_{IS}=\frac{63}{150}=0.42 estimated proportion of high speed internet users that had been interrupted one or more times in the past month.

p_{IS} true population proportion of high speed internet users that had been interrupted one or more times in the past month.

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

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".

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

1) Part a

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

t_{\alpha/2}=-1.96, t_{1-\alpha/2}=1.96

The confidence interval for the mean is given by the following formula:

\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

If we replace the values obtained we got:

0.42 - 1.96\sqrt{\frac{0.42(1-0.42)}{150}}=0.341

0.42 + 1.96\sqrt{\frac{0.42(1-0.42)}{150}}=0.499

The 95% confidence interval would be given by (0.341;0.499)

2) Part b

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by \alpha=1-0.99=0.01 and \alpha/2 =0.005. And the critical value would be given by:

t_{\alpha/2}=-2.58, t_{1-\alpha/2}=2.58

The confidence interval for the mean is given by the following formula:

\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

If we replace the values obtained we got:

0.42 - 2.58\sqrt{\frac{0.42(1-0.42)}{150}}=0.316

0.42 + 2.58\sqrt{\frac{0.42(1-0.42)}{150}}=0.524

The 99% confidence interval would be given by (0.316;0.524)

3) Part c

The margin of error for the proportion interval is given by this formula:

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)

And on this case we have that ME =\pm 0.05 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)

And replacing into equation (b) the values from part a we got:

n=\frac{0.42(1-0.42)}{(\frac{0.05}{1.96})^2}=374.32

And rounded up we have that n=335

4) Part d

The margin of error for the proportion interval is given by this formula:

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)

And on this case we have that ME =\pm 0.05 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)

And replacing into equation (b) the values from part a we got:

n=\frac{0.42(1-0.42)}{(\frac{0.05}{2.58})^2}=648.599

And rounded up we have that n=649

5 0
3 years ago
Other questions:
  • Find the measure of angle 1
    7·1 answer
  • A 25ft ladder is placed 7 feet from the wall, as shown. How high up the wall with the ladder reach?
    6·1 answer
  • Shakespear's Pizza sells 1 comma 100 large Vegi Pizzas per week for ​$16 a pizza. When the owner offers a​ $5 discount, the week
    8·1 answer
  • Alexandra wishes to surround his rectangular flower bed with a gravel walk 1 meter wide flower bed is 5m and the width is 4m. Wh
    13·1 answer
  • find the area of the regular decagon if the apothem is 5 inches and a side is 3.2 inches. Round to the nearest whole number
    9·1 answer
  • If a cubic polynomial has zeros at x= -4, x=0 and x=7, then
    14·2 answers
  • There is the option of buying two different rabbit colonies.
    6·1 answer
  • The dimensions of a rectangular prism are 5 cm, 5 cm, and 2 cm.
    11·1 answer
  • Mandy created a treasure hunt in the sand at the beach. To keep track of where she buried four items, she graphed their location
    7·2 answers
  • I need help please please
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!