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3 years ago

How can you use random samples to solve real world problems

Mathematics

2 answers:

yaroslaw [1]3 years ago

8 0

Random samples can provide more information on a population of people or things.

Hope I could be of help :)

DiKsa [7]3 years ago

8 0

Answer and Step-by-step explanation:

Random sample is a technique used to select people or items for research. You can use a software to random sampling. For example, if you have a group of 60 students and you have to divide them into two different courses, you can use a software to enter all the students' names and that it randomly divides them into two groups.

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In triangle ABC, if sin A= 4/5 and tan A= 4/3, the what is cos A? 3/5 4/5 3/4 5/3

laila [671]

Answer:

3/5

Step-by-step explanation:

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3 years ago

Find the Area of the figure below, composed of a rectangle with two semicircles removed. Round to the nearest tenths place.

Allisa [31]

Answer:

21.8

Step-by-step explanation:

hii so basically first we find the area of the 9 by 8 and subtract the area of the semicircles.

area of circles are πr^2, so in this situation

π4^2 which is 16π.

with this, the semicircle which is half a circle would give us

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but then, we have two semicircles removed so we would have as an answer:

(9*8)-8π+8π

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3 years ago

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3 years ago

When two six-sided dice are rolled, there are 36 possible outcomes. Find the probability that the sum is not 5.

zaharov [31]

Answer:

$p(Not\ 5) = \frac{8}{9}$

Step-by-step explanation:

Given:

Txo six-sided dice are rolled.

Total number of outcomes n(S) = 36

We need to find the probability that the sum is not equal to 5 p(Not 5).

Solution:

Using probability formula.

$P(E)=\frac{n(E)}{n(S)}$ ----------------(1)

Where:

n(E) is the number of outcomes favourable to E.

n(S) is the total number of equally likely outcomes.

The sum of two six-sided dice roll outcome is equal to 5 as.

Outcome as 5: {(1,4), (2,3), (3,2), (4,1)}

So, the total favourable events n(E) = 4

Now, we substitute n(E) and n(s) in equation 1.

$P(5)=\frac{4}{36}$

$p(5) = \frac{1}{9}$

Using formula.

$p(Not\ E) + p(E) = 1$

$p(Not\ 5) + p(5) = 1$

Now we substitute p(5) in above equation.

$p(Not\ 5) + \frac{1}{9} = 1$

$p(Not\ 5) = 1-\frac{1}{9}$

$p(Not\ 5) = \frac{9-1}{9}$

$p(Not\ 5) = \frac{8}{9}$

Therefore, the sum of two six-sided dice roll outcome is not equal to 5.

$p(Not\ 5) = \frac{8}{9}$

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3 years ago

Bob can paint a fence in 5 hours, and working with Jen, the two of them painted a fence in 2 hours. How long would it have taken

irakobra [83]

Answer: $\frac{10}{3}$

Step-by-step explanation:

Given

Bob can Paint a fence in 5 hr

so full job can be done in 5 hr

in 1 hr $\frac{1}{5}$ job is done

suppose Jen done the work in x hr

so in 1 hr $\frac{1}{x}$ part of job is done

Also if they combine they can do the job in 2 hr

so in 1 hr $\frac{1}{2}$

so $\frac{1}{5}+\frac{1}{x}=\frac{1}{2}$

$\frac{1}{x}=\frac{1}{2}-\frac{1}{5}$

$\frac{1}{x}=\frac{5-2}{10}$

$x=\frac{10}{3} hr$

3 0

3 years ago