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xz_007 [3.2K]
4 years ago
7

A statistics teacher wants to know how her students feel about an introductory statistics course. She decides to administer a su

rvey to a random sample of students taking the course. She has several sampling plans to choose from. Which plan is simple random sampling?
a) There are four grade levels of students taking the class: freshmen, sophomores, juniors, and seniors. Randomly select 15 students from each grade level
b) Randomly select a grade level (freshmen, sophomores, juniors, and seniors) and survey every student in that grade level
c) Each student has a nine-digit studentnumber. Randomly choose 60 numbers.
d) Using the class roster, select every fifth student from the list.
Mathematics
1 answer:
EleoNora [17]4 years ago
6 0

Answer:

the answer is d

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Which of the binomials below is a factor of this trinomial x^2+4x-60
trasher [3.6K]

Suppose x-6 is listed as a possible answer. That is zero if x = 6. So put x=6 into the original x^2 + 4x - 60 to get 6^2 + 4*6 - 60 = 36 + 24 -60 = 0. hence x-6 is a factor.

Answer (x-6)

on this hand :x-5 is not a factor, because plugging x=5 into does not work.

6 0
3 years ago
Simplify: - 4x 5x - 1 + 3-6x 3-6x​
Vitek1552 [10]

Answer:

−45−1+3−63−6

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Solution:

−46−63−6+2

Step-by-step explanation:

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3 0
3 years ago
The scale factor rounded to the nearest tenth.
mrs_skeptik [129]
Hey there! :)

In the big square, the side length is 3, and in the small one, it's 1

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1/3 = 0.3333 = 0.3

Your answer is 0.3

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5 0
3 years ago
How can Help me<br> (a+b)^2≥4ab
sattari [20]

Mark as brainlist___________________________________

5 0
3 years ago
Read 2 more answers
A collection of nickels and dimes is worth $6.10. There are 67 coins in all. how many nickels are there?
Dmitrij [34]

 Question 1:

 For this case, the first thing we must do is define variables.
 We have then:
 x: number of nickels
 y: number of dimes
 We write the system of equations that adapts to the problem.
 We have then:
 0.05x + 0.10y = 6.10
 x + y = 67
 Solving the system we have:
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 y = 55
 Answer:
 there are 12 nickels

 Question 2:

 For this case, the first thing we must do is define variables.
 We have then:
 x: Allan's score
 y: Dave's score
 We write the system of equations that adapts to the problem.
 We have then:
 x + y = 375
 x = 2y-60
 Solving the system we have:
 x = 230
 y = 145
 Answer:
 
Dave: 145 Allan: 230
7 0
3 years ago
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