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
aleksandr82 [10.1K]
3 years ago
13

Please help !!!! Thank you

Mathematics
1 answer:
Jlenok [28]3 years ago
8 0

Answer:

Step-by-step explanation:

56

You might be interested in
If you have 49 questions on a test what score must you get to pass the test?​
arsen [322]

Well, on every test I have at a school and I believe most schools do this. You need at leasr 80% to pass. But to pass you'd most likely need 80% or 70%. But if you get an 80% you'll be sure to pass! I hope this helps you!

7 0
3 years ago
I WILL GIVE BRAINLIEST!!!!!!
katovenus [111]

Answer:

I think Quadrant 1. I;m not trying to just answer for the points

Step-by-step explanation:

5 0
3 years ago
Computer Action Company sells computers and computer parts by mail. The company assures its customers that products are mailed a
Scorpion4ik [409]

Answer:

The t distribution is used, because we have the standard deviation for the sample.

Step-by-step explanation:

When to use the z or the t distribution?

When we have the standard deviation for the population, we use the z distribution.

When we have the standard deviation for the sample, we use the t distribution.

In this question:

We have the standard deviation for the sample, which means that the t distribution is used.

8 0
3 years ago
Compare the slopes of parallel lines and perpendicular lines?​
Gnesinka [82]

Answer: C

Step-by-step explanation: l-7&!:

4 0
3 years ago
Slices of pizza for a certain brand of pizza have a mass that is approximately normally distributed with a mean of 67.7 grams an
Alexxx [7]

Answer:

<u>a. s.e. = 0.338</u>

<u>b. The  probability of finding a random slice of pizza with a mass of less than 67.2 grams is 0.5871 or 58.71%</u>

<u>c. The probability of finding a 20 random slices of pizza with a mean mass of less than 67.2 grams is 0.0694 or 6.94%</u>

d. <u>The sample mean of 62.75 would represent the 15th percentile</u>

Step-by-step explanation:

1. Let's review the information provided to us to answer the question properly:

μ of the mass of slices of pizza for a certain brand = 67.7 grams

σ of the mass of slices of pizza for a certain brand = 2.28 grams

2. For samples of size 20 pizza slices, what is the standard deviation for the sampling distribution of the sample mean?

Let's recall that the standard deviation of the sampling distribution of the mean is called the standard error of the mean and its formula is:

μσs.e.= √σ/n, where n is the sample size.

s.e. = √2.28/20

<u>s.e. = 0.338</u>

3. What is the probability of finding a random slice of pizza with a mass of less than 67.2 grams?

Let's find the z-score for X = 67.2, this way:

z-score = (X - μ)/σ

z-score = (67.2 - 67.7)/2.28

z-score = 0.5/2.28

z-score = 0.22 (rounding to the next hundredth)

Now, using the z-table, let's find p, the probability:

p (z = 0.22) = 0.5871

<u>The  probability of finding a random slice of pizza with a mass of less than 67.2 grams is 58.71%</u>

4.  What is the probability of finding a 20 random slices of pizza with a mean mass of less than 67.2 grams?

Let's use the central limit theorem to find the z-score, this way:

z-score = X - μ/s.e

z-score = 67.2 - 67.7/0.338

z-score = -0.5/0.338

z-score = - 1.48

Now, using the z-table, let's find p, the probability:

<u>p (z = -1.48) = 0.0694</u>

5. What sample mean (for a sample of size 20) would represent the bottom 15% (the 15th percentile)?

For p = 0.150, let's find the z-score:

z-score = - 2.17

z-score = X - μ/s.e

- 2.17 = (X - 67.7)/2.28

- 4.95 = X - 67.7

X = 67.7 - 4.95

X = 62.75 (rounding to the next hundredth)

<u>The sample mean of 62.75 would represent the 15th percentile</u>

7 0
3 years ago
Other questions:
  • Write an expression for the sequence of operations described below.
    7·1 answer
  • What is the common ratio of the geometric sequence: -1/12, -1/2,-3,-18...?
    8·1 answer
  • What is 3 1/4 - 1 2/4 =
    15·2 answers
  • Find a particular solution yp of the following equation.
    14·1 answer
  • Identify the radius for the circle in standard form
    9·2 answers
  • Which linear inequality is represented by the graph? O y&lt;2/3x+3 (A)
    12·1 answer
  • 10. write the ratio in fraction as simplest form . 40gal : 72 gal​
    6·1 answer
  • Gail collects trading cards. Her favorites are baseball and football cards. For
    9·2 answers
  • Ciara buys 7 lb of strawberries for $5.81. How much would she spend if she wanted 15 lb of strawberries?
    7·2 answers
  • Needddddd helpppppp asapppp/ Necesitoooo ayudaaaaa rapidooo
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!