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Nina [5.8K]
4 years ago
7

A random sample was taken to determine whether students from a certain classroom prefer to shop at Store A, Store B, or Store C.

Which of the following would represent a random sample?
selecting all the students that have a last name that begins with R
selecting all the girls
putting all the names in a hat and selecting six students
putting all the names in alphabetical order and selecting every fourth student
Mathematics
2 answers:
steposvetlana [31]4 years ago
8 0
Putting all the names in a hat and selecting six students because the rest would not have been random because you know who you picked just by looking but if u put names in a hat you don't know who you picked.
g100num [7]4 years ago
5 0
Putting the names in a hat and selecting six students
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(2 x + 1):15=(x-1):7​
GalinKa [24]
(2 x + 1):15=(x-1):7
7(2x+1)=15(x-1)
14x+7=15x-15
14x-15x=-15-7
-x=-22
x=22
4 0
4 years ago
Read 2 more answers
7. A machine produces memory sticks of varying lengths, distributed uniformly between 3mm and 13 mm. Memory sticks longer than 1
Mars2501 [29]

Answer:

The proportion of memory sticks that will be scrapped is 0.3 = 30%.

Step-by-step explanation:

Uniform probability distribution:

An uniform distribution has two bounds, a and b.  

The probability of finding a value of at lower than x is:

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

The probability of finding a value between c and d is:

P(c \leq X \leq d) = \frac{d - c}{b - a}

The probability of finding a value above x is:

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

Distributed uniformly between 3mm and 13 mm.

This means that a = 3, b = 13

Calculate the proportion of memory sticks that will be scrapped:

P(X > 10) = \frac{13 - 10}{13 - 3} = \frac{3}{10} = 0.3

The proportion of memory sticks that will be scrapped is 0.3 = 30%.

6 0
3 years ago
The 64-ounce carton of orange juice costs $4.69. Find the unit price per ounce to the nearest tenth of a cent.
MrRa [10]

Answer:

13¢ per ounce

Step-by-step explanation:

just divide 64/4.69

8 0
3 years ago
Read 2 more answers
Can someone help me
kakasveta [241]

Answer:

a. 2*-2*3=-12

b. -2*3*5 = -30

c. (-2)^2+2*5= 14

d. 2*-2+3*3-5*5= -20

e. -2(3-5) = 4

f. 3*5-(-2)*5+(-2)*3 = 19

if it helped then plz mark me as brainliest

8 0
3 years ago
The authors of a paper titled "Age and Violent Content Labels Make Video Games Forbidden Fruits for Youth" carried out an experi
o-na [289]

Answer:

T = 290

Step-by-step explanation:

We can find the sum of all observations multiplying sample size (n) by sample mean (x).

Sum of all observations in the data set is,

T=n_{1} x_{1}+n_{2}x_{2}+n_{3}x_{3}+n_{4}x_{4}\\T=10(5.3)+10(7)+10(8.5)+10(8.2)\\T=53+70+85+82\\T=290

Hope this helps!

7 0
3 years ago
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