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
Sergeu [11.5K]
2 years ago
15

If you flip a coin 30 times, what is the best prediction possible for the number of times it will land on tails?

Mathematics
2 answers:
Mazyrski [523]2 years ago
8 0
15 times

A coin has a 50% to land on tails so 50% of 30 is 15 :)
Nimfa-mama [501]2 years ago
6 0

Answer:

15 times i think

Step-by-step explanation:

You might be interested in
We are given a coin for which the probability of heads is p (0 < p < 1) and the probability of tails is 1 - p. consider a
ra1l [238]
What are the Answer Choices?
6 0
3 years ago
According to the Knot, 22% of couples meet online. Assume the sampling distribution of p follows a normal distribution and answe
Ann [662]

Using the <em>normal distribution and the central limit theorem</em>, we have that:

a) The sampling distribution is approximately normal, with mean 0.22 and standard error 0.0338.

b) There is a 0.1867 = 18.67% probability that in a random sample of 150 couples more than 25% met online.

c) There is a 0.2584 = 25.84% probability that in a random sample of 150 couples between 15% and 20% met online.

<h3>Normal Probability Distribution</h3>

In a normal distribution with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

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

  • It 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, which is the percentile of X.
  • By the Central Limit Theorem, for a proportion p in a sample of size n, the sampling distribution of sample proportion is approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1 - p)}{n}}, as long as np \geq 10 and n(1 - p) \geq 10.

In this problem:

  • 22% of couples meet online, hence p = 0.22.
  • A sample of 150 couples is taken, hence n = 150.

Item a:

The mean and the standard error are given by:

\mu = p = 0.22

s = \sqrt{\frac{p(1 - p)}{n}} = \sqrt{\frac{0.22(0.78)}{150}} = 0.0338

The sampling distribution is approximately normal, with mean 0.22 and standard error 0.0338.

Item b:

The probability is <u>one subtracted by the p-value of Z when X = 0.25</u>, hence:

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

By the Central Limit Theorem:

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

Z = \frac{0.25 - 0.22}{0.0338}

Z = 0.89

Z = 0.89 has a p-value of 0.8133.

1 - 0.8133 = 0.1867.

There is a 0.1867 = 18.67% probability that in a random sample of 150 couples more than 25% met online.

Item c:

The probability is the <u>p-value of Z when X = 0.2 subtracted by the p-value of Z when X = 0.15</u>, hence:

X = 0.2:

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

Z = \frac{0.2 - 0.22}{0.0338}

Z = -0.59

Z = -0.59 has a p-value of 0.2776.

X = 0.15:

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

Z = \frac{0.15 - 0.22}{0.0338}

Z = -2.07

Z = -2.07 has a p-value of 0.0192.

0.2776 - 0.0192 = 0.2584.

There is a 0.2584 = 25.84% probability that in a random sample of 150 couples between 15% and 20% met online.

To learn more about the <em>normal distribution and the central limit theorem</em>, you can check brainly.com/question/24663213

4 0
2 years ago
Can y’all help me plz
WITCHER [35]

Answer:

Step-by-step explanation:

I think it is A

7 0
2 years ago
Read 2 more answers
Use the digits 2, 3, and 5 to create a fraction and a whole number with a product greater than 2
kupik [55]
The fractions which cannbe formed are: 2/3, 3/2, 2/5, 5/2, 3/5 and 5/3.
Now, we find the products with the third number:
2/3*5= 10/3 = 3.33 > 2
3/2*5 = 15 >2= 7.5 > 2
2/5*3= 6/5 (rejected)
5/2*3 = 15/2 > 2
3/5*2= 6/5 (rejected)
5/3*2 = 15/2 = 7.5> 2
5 0
3 years ago
Read 2 more answers
Show work for 694 divided by 3
tatuchka [14]

Answer: 231.3 repeating!

Step-by-step explanation: I used the calculator

8 0
2 years ago
Other questions:
  • When given 36 cubes, list 4 ways rectangular prisms can be created with a volume of 36 cubic units
    7·1 answer
  • PLEAAASE HELP! TON OF POINTS, ALL FREE FOR BRAINLIEST RIGHT ANSWER! GEOMETRY GUYSS
    11·2 answers
  • The circumference of the bike tire above is 84.152 inches. What is the radius of the bike tire? (Use 3.14 for .) A. 42.08 in B.
    5·1 answer
  • Any charges $12 more for five hours of babysitting then she does for three hours of babysitting. What does Amy charge per hour o
    11·2 answers
  • -x- y=-4<br> -2x+y=-5<br> How do you it for solving eliminating
    15·1 answer
  • the equation 9.95+.035s=c gives the cost c in dollars that a website charges for downloading songs. The variable s stands for th
    10·1 answer
  • The stopping distance for a boat in calm water is modelled by the function d(v) = 0.004v2 + 0.2v + 6, where d(v) is in metres an
    6·1 answer
  • A point on a graph is located at (0, -9). Which statement is true?
    5·2 answers
  • Drew's car weighs 1,344 kilograms. His car weighs 7 times as much as his motorcycle. How many grams does his motorcycle weigh? N
    8·1 answer
  • Which of the following is a correct interpretation of the expression -4 + 13−4+13minus, 4, plus, 13?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!