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]
3 years ago
7

Choose all the ones

Mathematics
2 answers:
ElenaW [278]3 years ago
8 0

Answer:

A, C, D

Step-by-step explanation:

A. $5.60 per class

$196 divided by 35

B. $6.50 per class

$260 divided by 40

C. $5.00 per class

$250 divided by 50

D. $5.50 per class

$55 divided by 10

E. $7.60 per class

$342 divided by 45

ch4aika [34]3 years ago
4 0
Avg price for A = $195/35 = $5.57
avg price for B = $260/40 = $6.50
avg price for C = $250/50 = $5
avg price for D = $55/10 = $5.50
avg price for E = $342/45 = $7.60

answer : A,C,D
You might be interested in
An experience bricklayer can construct a small wall in 3 hours. An apprentice can complete the job in 5 hours. Find how long it
Over [174]

Answer:

Step-by-step explanation:

If the bricklayer can construct the wall in its entirety in 3 hours, then he can get 1/3 of the job done in an hour.

If the apprentice can get the whole job done in 5 hours, then he can get 1/5 of the job done in an hour. If they both work together on said job, the equation is

\frac{1}{3}+\frac{1}{5}=\frac{1}{x} and now we solve for x. Multiply everything by the LCM to get rid of the fractions. That would be 15x:

15x(\frac{1}{3}+\frac{1}{5}=\frac{1}{x}) and doing that gives us

5x + 3x = 15 and

8x = 15 so

x = 1.875 hours which is 1 7/8 hours which is also 1 hour and 52 1/2 minutes.

3 0
3 years ago
A researcher reports survey results by stating that the standard error of the mean is 25 the population standard deviation is 40
bezimeni [28]

Answer:

a) A sample of 256 was used in this survey.

b) 45.14% probability that the point estimate was within ±15 of the population mean

Step-by-step explanation:

This question is solved using the normal probability distribution and the central limit theorem.

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

a. How large was the sample used in this survey?

We have that s = 25, \sigma = 400. We want to find n, so:

s = \frac{\sigma}{\sqrt{n}}

25 = \frac{400}{\sqrt{n}}

25\sqrt{n} = 400

\sqrt{n} = \frac{400}{25}

\sqrt{n} = 16

(\sqrt{n})^2 = 16^2[tex][tex]n = 256

A sample of 256 was used in this survey.

b. What is the probability that the point estimate was within ±15 of the population mean?

15 is the bounds with want, 25 is the standard error. So

Z = 15/25 = 0.6 has a pvalue of 0.7257

Z = -15/25 = -0.6 has a pvalue of 0.2743

0.7257 - 0.2743 = 0.4514

45.14% probability that the point estimate was within ±15 of the population mean

3 0
3 years ago
5b^2+3b-4 how do I find (x,y)?
GrogVix [38]

Answer:

DONT TRUST THE LINK OF OTHER USER AND REPORT

5 0
3 years ago
49x2-14x+1 whats the answer
stepladder [879]
98 - 14x + 1
-14x + (98 + 1)
-14x + 99

Answer: -14x + 99.
8 0
3 years ago
What time what give me 21
Lady bird [3.3K]
21:00 would be 9:00 :)
8 0
3 years ago
Other questions:
  • Ingrid walked her dog and washed her car. The time she spent walking her god was one-fourth the time it took her to wash her car
    15·2 answers
  • What number is equivalent to the expanded form shown below?
    5·1 answer
  • What is the simplified equation of y=sin(90-x)-sin(x-90)?????<br>please explain why.
    14·1 answer
  • Find the volume of this square<br> based pyramid.<br> 5ft<br> 6 ft<br> [? ]ft
    9·1 answer
  • What is the solution
    13·1 answer
  • The area of rectangular field is (49m2-42m+9).Find the dimensions of the field
    15·1 answer
  • 30% of which number is 3?
    10·2 answers
  • Is the equationy=-1/2 linear or nonlinear?
    8·1 answer
  • Ill give brainliest if you answer correct and asap!!! <br><br> Question: <br> -6x + 7) &gt; 120
    9·1 answer
  • Please help me I’ll give you 100 points
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!