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Karolina [17]
3 years ago
14

Assume that when adults with smartphones are randomly​ selected, ​57% use them in meetings or classes. If 8 adult smartphone use

rs are randomly​ selected, find the probability that exactly 4 of them use their smartphones in meetings or classes. The probability is
Mathematics
1 answer:
vovikov84 [41]3 years ago
6 0

Answer:

≈ 0.2526

Step-by-step explanation:

<u>The number of combinations of 4 out of 8:</u>

  • 8C4 = 8!/(4!(8-4)!)= 8*7*6*5/(1*2*3*4)= 70

<u>Success factor is: </u>

  • 57% = 0.57

<u>and failure factor is: </u>

  • (100 - 57)%= 43%= 0.43

<u>Probability:</u>

  • 0.57⁴*0.43⁴*70 ≈ 0.2526
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Solve x/3 = x+2/2. X=
Leni [432]

Answer:

I will assume that the term "x+2/2" is meant to be "(x + 2)/2)."  Otherwise the equation would read (x/3) = x + 1

Step-by-step explanation:

(x/3) = (x + 2)/2

x = 3*(x+2)/2   [Multiply both sides by 3]

x = (3x + 6)/2

x = (3/2)x + 6/2

x - (3/2)x = 3

-0.5x = 3

x = -6

====================

Check:

Does (x/3) = (x + 2)/2 for x = -6?

(-6/3) = (-6 + 2)/2

-2 = -4/2

-2 = -2  YES

6 0
2 years ago
What is the value of n in the equation 1/2(n – 4) – 3 = 3 – (2n + 3)?
ozzi
(1/2)(n - 4) - 3 = 3 - (2n + 3
Distribute the (1/2) on the left and the -1 on the right.
(1/2)n - 2 - 3 = 3 - 2n - 3
Combine like terms.
(1/2)n - 5 = -2n
Add 2n to both sides and add 5 to both sides
2.5n = 5
Divide both sides by 2.5
n = 2
6 0
3 years ago
Help me please and remember SHOW ALL WORK<br> TYSM!
Dima020 [189]
Vowels include AEIOU, so in the first box there is 2 vowel out of the 5 letters so 2/5 probability for the first box. Box 2 includes 2,4,6,8 as the even numbers out of the 9 numbers so 4/9
If you were solving the probability for each box individually that would be your answer
However if you are doing statistics and need to do it in a certain order you multiply the fractions
2/5 x 4/9 = 8/45
(.17777)
This leaves you with a 17% (8/45) chance of picking a vowel then an even number.
4 0
2 years ago
Read 2 more answers
You want to put $2,500 in a simple interest account. It has a 4% annual interest rate. How long will it take you to earn $200 in
Nadya [2.5K]
The formula is
I=prt
I interest earned 200
P principle 2500
R interest rate 0.04
T time ?
We need to solve for t
T=I÷pr
T=200÷(2,500×0.04)
T=2years

Hope it helps
6 0
3 years ago
To ensure that she obtained a sufficiently large number of minority respondents in a study on racial attitudes, a researcher div
soldi70 [24.7K]

Answer:

It is stratified random sampling.

Step-by-step explanation:

Stratified random sampling is a method of sampling that involves the division of a population into smaller sub-groups known as <em>strata.</em>

The strata are formed based on members' shared attributes or characteristics, in this case their race.

Stratified random sampling is also called <em>proportional random sampling</em> or <em>quota random sampling</em>

4 0
3 years ago
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