All categories

2 years ago

Here’s the answer you need to know

Mathematics

1 answer:

vovikov84 [41]2 years ago

8 0

Thank you sooo much Maddi441

You might be interested in

What is the simplified value of the expression below? 12.4 x (negative 6.3)

MrRa [10]

Answer:

78.12

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

What is the answer to this problem?

valkas [14]

Answer:

Step-by-step explanation:

DEF=180

DE=120

180-120=60

i hope this helps

5 0

3 years ago

A commuter must pass through 5 traffic lights on her way to work and will have to stop at each one that is red. She estimates th

sergij07 [2.7K]

Answer:

(a) The mean or expected value of X is 2.2.

(b) The standard deviation of X is 1.3.

Step-by-step explanation:

Let X = number of times the traffic light is red when a commuter passes through the traffic lights.

The probability distribution of X id provided.

The formula to compute the mean or expected value of X is:

$\mu=E(X)=\sum x.P(X=x)$

The formula to compute the standard deviation of X is:

$\sigma=\sqrt{E(X^{2})-(E(X))^{2}}$

The formula of E (X²) is:

$E(X^{2})=\sum x^{2}.P(X=x)$

(a)

Compute the expected value of X as follows:

$E(X)=\sum x.P(X=x)\\=(0\times0.06)+(1\times0.25)+(2\times0.35)+(3\times0.15)+(4\times0.13)+(5\times0.06)\\=2.22\\\approx2.2$

Thus, the mean or expected value of X is 2.2.

(b)

Compute the value of E (X²) as follows:

$E(X^{2})=\sum x^{2}.P(X=x)\\=(0^{2}\times0.06)+(1^{2}\times0.25)+(2^{2}\times0.35)+(3^{2}\times0.15)+(4^{2}\times0.13)+(5^{2}\times0.06)\\=6.58$

Compute the standard deviation of X as follows:

$\sigma=\sqrt{E(X^{2})-(E(X))^{2}}\\=\sqrt{6.58-(2.22)^{2}}\\=\sqrt{1.6516}\\=1.285\\\approx1.3$

Thus, the standard deviation of X is 1.3.

4 0

3 years ago

Read 2 more answers

Find the circumference of the figure.

shtirl [24]

Answer:

About 23.9 in

Step-by-step explanation:

We are given ;

a circle whose radius is 3.8 inches

we are required to determine the circumference

The circumference is given by the formula;

=2πr

Therefore;

Circumference = 2×3.14×3.8 in

=23.864 in

= 23.9 in

Therefore, the circumference of the figure is about 23.9 in

4 0

2 years ago

Solve for X 3x + 5=50

Nikolay [14]

Answer:

Let's solve!

Step-by-step explanation:

$3x + 5 = 50$

$-5$ $-5$

$\frac{3x}{3} = \frac{45}{3}$

$x = 15$

I hope this helps!

<h2>PLEASE MARK BRAINLIEST!</h2>

6 0

2 years ago

Read 2 more answers