- Surveying the boys in the freshman class is biased. It doesn’t take a sample from all of the school, it is from only one grade and one gender.
-Surveying every other student in the cafeteria would be biased IF only a certain grade was in there at a certain time. If every student was in the cafeteria at the same time, it would be non biased.
-Students in her math class is biased- it only considers those in a certain class, not everyone.
-20 from each grade at random is NOT biased, it considers every grade and 20 random students.
-Chess club is biased. Only students in one particular group get to answer. Hope this helps!
Answer:
<u>0.36 or 36%</u>
Step-by-step explanation:
<u>Finding the Mean Probability</u>
- Number of total green marbles / Number of total experimentss
- 1 + 5 + 3 / 4 + 12 + 9
- 9/25
- <u>0.36 or 36%</u>
Answer:
Step-by-step explanation:
You can solve this type of question two ways:
First cross multiply:
<u>x </u> = <span><u>3</u>
</span>42 7
(42)(3) = (7)(x)
This becomes :
126 = 7x
To solve for x divide both sides by 7 and you get x = 18
The other way to solve it is to think, what do I need to do to get x all by itself?
Since it's being divided by 42, you need to multiply each side of the equation by 42.
42 * <u>x</u> = <span><u>3</u> * 42
</span> 42 7
This leaves you with x = (42*3)/2
This simplifies to x = 18
Answer:
7
Step-by-step explanation:
a² + b² = c²
a² = c² - b²
a² = 25² - 24²
a² = 625 - 576
a² = 49
a = 7