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
Igoryamba
3 years ago
6

Is this a valid conclusion? A. B. C. D.

Mathematics
2 answers:
Fofino [41]3 years ago
8 0

Answer: a.

Step-by-step explanation:

qaws [65]3 years ago
5 0

Answer:

goodbye is a great conclusion

You might be interested in
Use substitution to solve the following system of equations. Show all of your work. Write the solution as an ordered pair.
trapecia [35]

Answer:

\left \{ {{x=2} \atop {y=2}} \right.

Step-by-step explanation:

Substitute the second equation into the first one:

4x+(2x-2)=10\\6x-2=10\\6x=12\\x=2

Substitute x=2 into the second equation:

y=2\times 2-2\\y=4-2\\y=2

\therefore \left \{ {{x=2} \atop {y=2}} \right.

3 0
2 years ago
Find the value of X in the simplest radical form
Galina-37 [17]

Answer:. 7


Step-by-step explanation:


4 0
3 years ago
Can you do the full work
Illusion [34]

Answer:

what full work.Everyone wants to know so we can help you.

Step-by-step explanation:

5 0
3 years ago
Time spent using​ e-mail per session is normally​ distributed, with mu equals 11 minutes and sigma equals 3 minutes. Assume that
liq [111]

Answer:

a) 0.259

b) 0.297

c) 0.497

Step-by-step explanation:

To solve this problem, it is important to know the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using 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 random variable X, with mean \mu and standard deviation \sigma, a large sample size can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}

In this problem, we have that:

\mu = 11, \sigma = 3

a. If you select a random sample of 25 ​sessions, what is the probability that the sample mean is between 10.8 and 11.2 ​minutes?

Here we have that n = 25, s = \frac{3}{\sqrt{25}} = 0.6

This probability is the pvalue of Z when X = 11.2 subtracted by the pvalue of Z when X = 10.8.

X = 11.2

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

By the Central Limit Theorem

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

Z = \frac{11.2 - 11}{0.6}

Z = 0.33

Z = 0.33 has a pvalue of 0.6293.

X = 10.8

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

Z = \frac{10.8 - 11}{0.6}

Z = -0.33

Z = -0.33 has a pvalue of 0.3707.

0.6293 - 0.3707 = 0.2586

0.259 probability, rounded to three decimal places.

b. If you select a random sample of 25 ​sessions, what is the probability that the sample mean is between 10.5 and 11 ​minutes?

Subtraction of the pvalue of Z when X = 11 subtracted by the pvalue of Z when X = 10.5. So

X = 11

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

Z = \frac{11 - 11}{0.6}

Z = 0

Z = 0 has a pvalue of 0.5.

X = 10.5

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

Z = \frac{10.5 - 11}{0.6}

Z = -0.83

Z = -0.83 has a pvalue of 0.2033.

0.5 - 0.2033 = 0.2967

0.297, rounded to three decimal places.

c. If you select a random sample of 100 ​sessions, what is the probability that the sample mean is between 10.8 and 11.2 ​minutes?

Here we have that n = 100, s = \frac{3}{\sqrt{100}} = 0.3

This probability is the pvalue of Z when X = 11.2 subtracted by the pvalue of Z when X = 10.8.

X = 11.2

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

By the Central Limit Theorem

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

Z = \frac{11.2 - 11}{0.3}

Z = 0.67

Z = 0.67 has a pvalue of 0.7486.

X = 10.8

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

Z = \frac{10.8 - 11}{0.3}

Z = -0.67

Z = -0.67 has a pvalue of 0.2514.

0.7486 - 0.2514 = 0.4972

0.497, rounded to three decimal places.

5 0
3 years ago
Judy bought a coat at a 20% discount sale for $68. What was the original price of the coat?
11111nata11111 [884]
80% of (Cost) = $68

80% is also 0.8:

0.8 x Cost = $68

dividing each side by 0.8

Cost = 68 / 0.8 = 85 = $85
8 0
3 years ago
Other questions:
  • Find the x-intercept for the line represented by this equation.
    9·1 answer
  • For a snack. lali ate 2/4 of an apple. makeo ate 3/4 of a peanut butter sandwhich. which girl ate more
    13·1 answer
  • Bob guessed there was 560 in they jar but there was actually 620. What percent was Bob's guess incorrect
    15·2 answers
  • Cynthia takes her dog to the park every 2 days. She bathes her dog every 7 days. If she took her dog to the park and bathed him
    5·1 answer
  • Has 3/4 hour to play video games take some 1/12 hour to set up the system each round of his favorite game takes 1/6 hours how ma
    7·1 answer
  • Aaron earns $781.92 per week. Aaron has
    10·1 answer
  • What’s the answer please help
    11·1 answer
  • Ra'Shaela is going to the store to buy candy. She has $3.45 in dimes and
    6·1 answer
  • I NEED HELP ASAP<br> "Find the measure of each angle in the following diagram"
    15·2 answers
  • The equations in elimination method are written in the standard form as _______________.ax - by = cax + by + c = 0Ax + By = Cax
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!