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3 years ago

Please help I need to get school work done before 3

Mathematics

1 answer:

Leno4ka [110]3 years ago

3 0

1-distributed property
2.Multiplication
3.addition
4.Divison
5.Sum

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Ann purchased a prepaid phone card for $20. Long distance calls cost 11 cents a minute using this card. Ann used her card only o

inn [45]

Answer:

I believe the answer is 33 minutes.

Step-by-step explanation:

20$-16.37 is 3.63$

.11cents × 33 minutes is 3.63$

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3 years ago

What is the area of the polygon given below?

almond37 [142]

Answer:

diện tích đa giác trong hình là :

186 cm2

Step-by-step explanation:

hãy tách hình đa giác trên thành 4 hình chữ nhật và tính diện tích từng hình chữ nhật

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3 years ago

In Grafton, a rural area in Vermont, the distance (in meters) between telephone poles has a uniform distribution between 40 and

coldgirl [10]

Answer:

a) 60% probability that the distance is environment friendly.

b) The mean of the distances between the telephone poles is 52.5 meters.

c) The standard deviation of the distance between the telephone poles is 7.22 meters.

Step-by-step explanation:

An uniform probability is a case of probability in which each outcome is equally as likely.

For this situation, we have a lower limit of the distribution that we call a and an upper limit that we call b.

The probability that we find a value X lower than x is given by the following formula.

$P(X \leq x) = \frac{x - a}{b-a}$

Uniform distribution between 40 and 65 meters.

This means that $a = 40, b = 65$

a) Any distance between poles greater than 50 meters is considered to be environment friendly. What is the probability that the distance is environment friendly?

This is $P(X > 50)$

We have that

$P(X \leq 50) + P(X > 50) = 1$

$P(X > 50) = 1 - P(X \leq 50)$

$P(X \leq 50) = \frac{50 - 40}{65 - 40} = 0.4$

$P(X > 50) = 1 - P(X \leq 50) = 1 - 0.4 = 0.6$

60% probability that the distance is environment friendly.

b) Find the mean of the distances between the telephone poles

The mean of the uniform distribution is

$M = \frac{a + b}{2}$

$M = \frac{a + b}{2} = \frac{40 + 65}{2} = 52.5$

c) Find the standard deviation of the distance between the telephone poles.

The standard deviation of the uniform distribution is:

$S = \sqrt{\frac{(b-a)^{2}}{12}}$

$S = \sqrt{\frac{(65-40)^{2}}{12}} = 7.22$

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3 years ago

"Punkin Chunkin," or Pumpkin Chunking, is the sport of launching pumpkins with

olga_2 [115]

Answer:the answer is a

Step-by-step explanation:because I said so

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3 years ago

Grade 7 students were surveyed to determine how many hours a day they spent, on average, doing various activities. The results a

otez555 [7]

Hello,

There are 24 hours in a day. If 25% of your day is spent at school, then you spent (24)(0.25) = 6 hours at school.

If 8% of your day is spent eating, then you spent (24)(0.08) = 1.92 hours eating.

Together, this is 6 + 1.92 = 7.92 hours ≈ 7.9 hours spent at school and eating in one day.

Hope this helps!

6 0

3 years ago

Please help I need to get school work done before 3​

Please help I need to get school work done before 3