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Zina [86]
4 years ago
6

You want to estimate the number of students in a junior high school who ride the school bus. which sample is unbiased?​

Mathematics
1 answer:
Vika [28.1K]4 years ago
8 0

Answer:

Option B - 90 students at random during lunch

Step-by-step

An unbiased sample is defined as:

A sample is an unbiased sample if every individual or the element in the population has an equal chance of being selected.

Based on this, we can eliminate:

Option A) - It prevents non-eighth-graders of the school from being represented.

Option C) - Students in a hallway might take a particular class together/may be of the same grade. This gives them an unfair advantage.

Option D) - All students who are not in chorus are not represented in this set.

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Please help me solve!-
ruslelena [56]
R=17

5(17-2)=75

5(15)=75

75=75
4 0
3 years ago
-1/5c+2+c=1/5(10c-20)
Andreyy89

Let's solve your equation step-by-step.

(− 1 /5 )(c)+2+c= 1 /5  (10c−20)

Step 1: Simplify both sides of the equation.

(− 1 /5 )(c)+2+c= 1 /5 (10c−20)

(− 1 /5 )(c)+2+c=( 1 /5 )(10c)+( 1 /5 )(−20) (Distribute)

−1 /5 c+2+c=2c+−4

( −1 /5 c+c)+(2)=2c−4 (Combine Like Terms)

4 /5 c+2=2c−4

4 /5 c+2=2c−4

Step 2: Subtract 2c from both sides.

4/5 c+2−2c=2c−4−2c

−6 /5 c+2=−4

Step 3: Subtract 2 from both sides.

−6 /5 c+2−2=−4−2

−6 /5 c=−6

Step 4: Multiply both sides by 5/(-6).

( 5 /−6 )*( −6 /5 c)=( 5 /−6 )*(−6)

c=5

Answer:

c=5

7 0
3 years ago
How do I rewrite this algebra problem 9x_-72
abruzzese [7]
9x-72=
9÷9= 1
72÷9=8
so... x-8
5 0
3 years ago
Read 2 more answers
Together, Steve and Tom sold 98 raffle tickets for their school. Steve sold 17 more than twice as many raffle tickets as Tom. Ho
victus00 [196]
Tom's tickets: x

98=x+2x+17
98=3x+17
81=3x
27=x

Tom's tickets 27
Steve's tickets 71

check 3(27)+ 17= 98
3 0
3 years ago
Please help WOrth 10 points
rjkz [21]

Answer:

52 cubic units

Step-by-step explanation:

1. Divide the shape into 2 parts:

The first one: a 2 by 4 by 6 rectangular prism.

The second one: a 1 by 4 by 1 rectangular prism.

2. Find the volumes of the prisms.

2*4*6=48

1*4*1=4

3. Add the two volumes

48+4=52 cubic units (or units^3)

6 0
3 years ago
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