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3 years ago

How do i find the answer?

Mathematics

1 answer:

luda_lava [24]3 years ago

4 0

Answer:

jhgfghjk

Step-by-step explanation:

tngbunjregtnmf rejdmnf vfrjelkfnm e3jkwnrmfd

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The diameter of a circle is 16 kilometers. what is the circle's circumference? use 3.14 for ????.

Andreyy89

D=16km
r=8km

circumference of a circle= 2πr

= 2*3.14*8

=50.24km

P.S 3.14 is used as the value for π (pie)

3 0

3 years ago

Read 2 more answers

A test has 20 true/false questions. What is the probability that a student passes the test if they guess the answers? Passing me

Minchanka [31]

Using the binomial distribution, it is found that:

The probability that the student will get 15 correct questions in this test by guessing is 0.0207 = 2.07%.

For each question, there are only two possible outcomes, either the guess is correct, or it is not. The guess on a question is independent of any other question, hence, the binomial distribution is used to solve this question.

Binomial probability distribution

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$C_{n,x} = \frac{n!}{x!(n-x)!}$

The parameters are:

x is the number of successes.

n is the number of trials.

p is the probability of a success on a single trial.

In this problem:

There are 20 questions, hence $n = 20$ .

Each question has 2 options, one of which is correct, hence $p = \frac{1}{2} = 0.5$

The probability is:

$P(X \geq 15) = P(X = 15) + P(X = 16) + P(X = 17) + P(X = 18) + P(X = 19) + P(X = 20)$

In which:

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 15) = C_{20,15}.(0.5)^{15}.(0.5)^{5} = 0.0148$

$P(X = 16) = C_{20,16}.(0.5)^{16}.(0.5)^{4} = 0.0046$

$P(X = 17) = C_{20,17}.(0.5)^{17}.(0.5)^{3} = 0.0011$

$P(X = 18) = C_{20,18}.(0.5)^{18}.(0.5)^{2} = 0.0002$

$P(X = 16) = C_{20,19}.(0.5)^{19}.(0.5)^{1} = 0$

$P(X = 17) = C_{20,20}.(0.5)^{20}.(0.5)^{0} = 0$

Then:

$P(X \geq 15) = P(X = 15) + P(X = 16) + P(X = 17) + P(X = 18) + P(X = 19) + P(X = 20) = 0.0148 + 0.0046 + 0.0011 + 0.0002 + 0 + 0 = 0.0207$

The probability that the student will get 15 correct questions in this test by guessing is 0.0207 = 2.07%.

You can learn more about the binomial distribution at brainly.com/question/24863377

6 0

3 years ago

Someone answer please :)

vlabodo [156]

Answer:

1 : 11

Step-by-step explanation:

9 : 99 = divide both numbers by 9
1 : 11

5 0

3 years ago

What 2x ? = 10 ❄️❄️❄️❄️❄️

Afina-wow [57]

Answer:

Step-by-step explanation:

divide 10 by 2 and you get 5.

7 0

3 years ago

Read 2 more answers

Find the area of the shaded region. Show all work in order to receive credit.

antoniya [11.8K]

area of square = 14^2 = 196 square cm

area of circle = 3.14 *7^2 = 153.86 square cm

196 - 153.86 = 42.14 square cm is shaded

3 0

4 years ago