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elena55 [62]
3 years ago
13

In a recent survey, 80% of the community favored building a police substation in their neighborhood. If 15 citizens are chosen,

what is the mean number favoring the substation?
Mathematics
1 answer:
KATRIN_1 [288]3 years ago
7 0

Answer:

The mean number favoring the substation is 12 citizens.

Step-by-step explanation:

For each citizen surveyed, there are only two possible outcomes. EIther they favored building a police substation in their neighborhood, or they opposed. This means that we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, with p probability, and X can only have two outcomes.

Has an expected value of:

E(X) = np

In this problem, we have that:

n = 15, p = 0.8

E(X) = 15*0.8 = 12.

The mean number favoring the substation is 12 citizens.

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Please help me I really need help
Oliga [24]

Answer:

Step-by-step explanation:

(1) 2x - 6y = -12

(2) x + 2y = 14

There is a -6y and a +2y. Since they have opposite signs, I'll try to eliminate the y terms. (That's my choice. There is more than one way to solve these.)

Multiply eq. (2) by 3:

3x + 6y = 42

Then add the result to eq. (1) to eliminate the y terms:

2x - 6y = -12

3x + 6y = 42

------------------

5x   = 30,  so x = 6

Now plug the value of x into eq. (2) and solve for y:

6 + 2y = 14

2y = 8

y = 4

Why did I use eq. (2) to solve for y? Because it's less work. I could have used eq. (1) instead:

2(6) - 6y = -12

12 - 6y = -12

-6y = -24

y = 4

More than one way to solve.

5 0
3 years ago
a car moves with the speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 5 minutes find the total dist
Gekata [30.6K]

Answer: 8

Step-by-step explanation:

Umm idk

4 0
3 years ago
PLEASE HELP!
elena-14-01-66 [18.8K]
The answer is 15 because absolute deviation means a number of units a certain number is for 0. So, both 15 and -15 would have an absolute deviation of 15 because both numbers are 15 units away from 0. Hope I helped! Please rate me the Brainliest!
6 0
3 years ago
Read 2 more answers
11.<br> {THE LAST ONE, LETS GO! THIS IS A POG MOMENT}
Vladimir [108]
I think it’s 22- yes it is a very pog moment. take this Wilbur Soot charm for good luck. :)
5 0
3 years ago
Factor –7x3 21x2 3x – 9 by grouping. what is the resulting expression? (3 – 7x)(x2 – 3) (7x – 3)(3 x2) (3 – 7x2)(x – 3) (7x2 – 3
juin [17]

The factors of the expression are \rm(3 - 7x^2)(x - 3)

<h3>How to find factors in the expression?</h3>

First group the first two terms and the last two terms together respectively.

The factors of the expression are given by;

\rm= -7x^3 + 21x^2 + 3x - 9\\\\=-7x^2(x - 3) + 3(x - 3)\\\\=(3 - 7x^2)(x - 3)

Hence, the factors of the expression are \rm \rm(3 - 7x^2)(x - 3).

To know more about factors click the link given below.

brainly.com/question/9645056

8 0
2 years ago
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