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3 years ago

12

HELP WILL GIVE BRAINLIEST

1 answer:

Mariana [72]3 years ago

5 0

On the 4th question I can’t tell if those are dots or arrows on the line above “AN” when it says “B lies on AN”, if those are 2 dots on the little line don’t check it, if they are 2 little arrows on the line then check the box, but other than that the rest of the checked are right!!

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What is the factored form of a2 – 121?

Elina [12.6K]

A^2 -121 = a^2 -11^2 = (a-11)(a+11)

so the second choice is right sure

5 0

3 years ago

The commute time for people in a city has an exponential distribution with an average of 0.5 hours. What is the probability that

mamaluj [8]

Answer:

0.314 = 31.4% probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours

Step-by-step explanation:

Exponential distribution:

The exponential probability distribution, with mean m, is described by the following equation:

$f(x) = \mu e^{-\mu x}$

In which $\mu = \frac{1}{m}$ is the decay parameter.

The probability that x is lower or equal to a is given by:

$P(X \leq x) = \int\limits^a_0 {f(x)} \, dx$

Which has the following solution:

$P(X \leq x) = 1 - e^{-\mu x}$

The probability of finding a value higher than x is:

$P(X > x) = 1 - P(X \leq x) = 1 - (1 - e^{-\mu x}) = e^{-\mu x}$

In this question:

$m = 0.5, \mu = \frac{1}{0.5} = 2$

What is the probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours?

$P(0.4 \leq X \leq 1) = P(X \leq 1) - P(X \leq 0.4)$

In which

$P(X \leq 1) = 1 - e^{-2} = 0.8647$

$P(X \leq 0.4) = 1 - e^{-2*0.4} = 0.5507$

So

$P(0.4 \leq X \leq 1) = P(X \leq 1) - P(X \leq 0.4) = 0.8647 - 0.5507 = 0.314$

0.314 = 31.4% probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours

4 0

3 years ago

There are 9,485 elementary school students in the surrounding cities. If there are 5 elementary schools and each school has the

kenny6666 [7]

1,897
9485/5=1897
Divide

8 0

4 years ago

Read 2 more answers

. Find the variance of the set of numbers 2,3,5,6,8.

lakkis [162]

Answer:

putang ina mo asa ka sa brianly

4 0

3 years ago

(3x+40)=(5x) what is the value of x

kramer

So I first subtracted 3x on each side, then 2x would equal 40 and then to find x, divide both sides by 2

8 0

4 years ago