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allochka39001 [22]
4 years ago
15

A middle school principal wants to change the lunch menu at the school. The principal surveys the students to determine how the

students would feel about the changes. Which survey method will produce the best representative sample?
A: survey every fifth student who rides in a car to school
B: survey 3 randomly selected students from every homeroom
C: survey every tenth seventh grade student during lunch
D: survey 5 randomly selected students from every art, drama, and music class
Mathematics
2 answers:
IceJOKER [234]4 years ago
7 0
I think A or D PLEASE MARK BRAINLIEST
kotykmax [81]4 years ago
6 0

Answer:

Is a

Step-by-step explanation:

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A department store surveyed 428 shoppers, and the following information was obtained: 216 shoppers made a purchase, and 294 were
Maurinko [17]

Answer:

(a) 169

(b) 341

(c) 125

(d) 87

Step-by-step explanation:

Consider the Venn diagram below.

The total number of shoppers surveyed is, <em>N</em> = 428.

Number of shoppers who made a purchase, <em>n</em> (P) = 216

Number of shoppers who were satisfied with the service they received,

<em>n</em> (S) = 294

Number of shoppers who made a purchase but were not satisfied with the service, n(S^{c}\cap P) = 47

(a)

The number of shoppers who made a purchase and were satisfied with the service = <em>n</em> (S ∩ P)

             n(S\cap P)=n(P)-n(S^{c}\cap P)\\=216-47\\=169

(b)

The numbers of shoppers who made a purchase or were satisfied with the service = <em>n</em> (P ∪ S)

               n(P\cup S)=n(P)+n(S)-n(P\cap S)\\=n(P)+n(S)-n(S\cap P)\\=216+294-169\\=341

(c)

The numbers of shoppers who were satisfied with the service but did not make a purchase = n(S\cap P^{c})

n (S\cap P^{c} ) = n (S) - n (S \cap P)\\=294-169\\=125

(d)

The number of shoppers who were not satisfied and did not make a purchase  = n(S^{c}\cap P^{c})

n(S^{c}\cap P^{c})=N-n(S\cup P)\\=N-n(P\cup S)\\=428-341\\=87

6 0
3 years ago
What is the probability of tossing a coin three times and getting heads<br> each time? *
Serggg [28]

Answer:

probability of tossing a coin 3 times and getting heads each time is 1/8

Step-by-step explanation:

A coin has 2 sides (heads and tails) therefore you have a 50% chance of getting either heads or tails for each toss. Therefore, the probability of getting heads for 1 toss is 1/2. Now, tossing it 3 times and getting heads each time essentially means you would have to do (1/2)×(1/2)×(1/2) which would give you 1/8 as the probability of tossing a coin 3 times and getting heads each time.

5 0
3 years ago
How to graph the function f(x)=-2(x+3) +4
Paraphin [41]

Answer:

Step-by-step explanation:

first of all, simplify your fraction. f(x)= -2(x+3) + 4

                                                     f(x)= (-2x-6) + 4

                                                     f(x)= -2x-2

y intercept is -2 and the slope is -2, go down 2 and right 1

3 0
3 years ago
I need help with this part, someone help me out :)
Alexandra [31]

Answer:

A & B

Step-by-step explanation:

A) V = pi×r²×h

= 3.142 × 8² × 5 = 1005.44 cm³

B) V = ⅓ × 18×16 × 12 = 1152 cm³

C) V = ½×5×3 × 7 = 52.5 cm³

4 0
3 years ago
What value of x is in the solution set of 2(3x - 1) = 4x - 6?
Viefleur [7K]

Answer:

-2.5 = x

Step-by-step explanation:

Multiply by what's in the parentheses by 2.

6x - 1 = 4x - 6

Add 6 to both sides of equation.

6x + 5 = 4x

Subtract 6x from both sides.

5 = -2x

Divide both sides by -2.

-2.5 = x

4 0
3 years ago
Read 2 more answers
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