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
stealth61 [152]
2 years ago
12

Use the following dot plot to answer the questions.

Mathematics
1 answer:
cupoosta [38]2 years ago
8 0

Answer:

3.4

Decrease ; 3.375

Step-by-step explanation:

Mean = Σfx / Σf

Σfx = (1 * 2) + (2 * 2) + (3 * 3) + (4 * 9) = 51

Σf = 1 + 2 + 3 + 9 = 15

Mean = 51 / 15 = 3.4

If 1 more dot is added to the 3rd column:

Σfx = (1 * 2) + (2 * 2) + (3 * 4) + (4 * 9) = 54

Σf = 1 + 2 + 4 + 9 = 16

Mean = 54 / 16 = 3.375

You might be interested in
Am I correct? If so why?
babunello [35]

Answer: its correct

Step-by-step explanation: and its correct cuase its the answer you choose

7 0
2 years ago
Grace and her brother Sid want to raise money to go to band camp. Their parents have agreed to help them up to $400 by paying th
Cerrena [4.2K]

Answer:

I think it would be 25m + 10b = 400

6 0
3 years ago
I am trying Find the surface area of a prism or cube and it only has 3.5<br>​
Kryger [21]
Surface Area of Cube = width^2 * 6 (sides of the cube)

Therefore, (3.5)^2 * 6 =

73.5 [whatever units]^2
4 0
2 years ago
A random sample of 40 binomial trials resulted in 14 successes. test the claim that the population proportion of successes does
mylen [45]

Using the z-distribution, since the p-value of the test is of 0.057 > 0.05, there is not enough evidence that the population proportion of successes does not equal 0.50.

<h3>What are the hypotheses tested?</h3>

At the null hypotheses, we test if the proportion of successes equals 0.5, hence:

H_0: p = 0.5

At the alternative hypotheses, we test if it does not equal, hence:

H_1: p \neq 0.5

<h3>What is the test statistic?</h3>

The test statistic is given by:

z = \frac{\overline{p} - p}{\sqrt{\frac{p(1-p)}{n}}}

In which:

  • \overline{p} is the sample proportion.
  • p is the proportion tested at the null hypothesis.
  • n is the sample size.

For this problem, the parameters are given by:

n = 40, \overline{p} = \frac{14}{40} = 0.35, p = 0.5

Hence the test statistic is given by:

z = \frac{\overline{p} - p}{\sqrt{\frac{p(1-p)}{n}}}

z = (0.35 - 0.5)/(0.5/sqrt(40))

z = -1.9.

<h3>What is the decision?</h3>

Using a z-distribution calculator, considering a two-tailed test, as we are testing if the proportion is different of a value, with z = -1.9, we get that the p-value of the test is of 0.057.

Since the p-value of the test is of 0.057 > 0.05, there is not enough evidence that the population proportion of successes does not equal 0.50.

More can be learned about the z-distribution at brainly.com/question/16313918

#SPJ4

5 0
1 year ago
Identify the closest perfect squares less than and greater than the radicand below, respectively.
wariber [46]
It would be A because they’re both perfect squares
3 0
3 years ago
Other questions:
  • What decimal is represented by this expanded form? 3X1000 + 6X100 + 1X10 + 2X1/10 + 1X 1/1000
    14·2 answers
  • Suppose a random sample of 100 observations from a binomial population gives a value of pˆ = .63 and you wish to test the null h
    5·1 answer
  • Ten year old Chi learned a lot of math from his older brother, Shing. One day, Shing told him that when you multiply a number by
    5·2 answers
  • Problem 3 A bank charges a service fee of $7.50 per month for a checking account. A bank account has $85.00. If no money is depo
    15·1 answer
  • ABE is a triangle. can you use the sss postulate or the sas postulate to prove triangle ABC is congruent to triangle AED?
    13·1 answer
  • What part of an hour elapses from 3:12 P.M. to 4:30 P.M.?
    11·1 answer
  • jessica will babysit children for $8 an hour. ciara will babysit for an appointment fee of $12 and $4 an hour. how many hours wo
    13·2 answers
  • Y=(x+1)^2+2<br><br>plot five points​
    7·1 answer
  • I need help with these please
    8·1 answer
  • Why is it undefined for the equation 0/0?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!