Answer:
A = 10.5%
B = 28.9%
C = 39.5%
D = 18.4%
F = 2.6%
Step-by-step explanation:
Add all the frequencies together = 38
- 4/38 × 100 = 10.5%
- 11/38 × 100 = 28.9%
- 15/38 × 100 = 39.5%
- 7/38 × 100 = 18.4%
- 1/38 × 100 = 2.6%
10.5 + 28.9 + 39.5 + 18.4 + 2.6 = 100%
Let x represent Holly's score on 7th math quiz.
We have been given that the mean of Holly's first six math quiz scores was 75%. This means that the average on 1st 6 math quizzes is 75.
To find the total scores on 1st 6 math quizzes, we will multiply 75 by 6 that is
.
We will use average formula to find test scores on 7th math quiz.
![\text{Average of 7 math quizzes}=\frac{\text{Sum of scores on 7 math quizzes}}{\text{7 quizzes}}](https://tex.z-dn.net/?f=%5Ctext%7BAverage%20of%207%20math%20quizzes%7D%3D%5Cfrac%7B%5Ctext%7BSum%20of%20scores%20on%207%20math%20quizzes%7D%7D%7B%5Ctext%7B7%20quizzes%7D%7D)
![77=\frac{x+450}{7}](https://tex.z-dn.net/?f=77%3D%5Cfrac%7Bx%2B450%7D%7B7%7D)
Let us solve for x.
![77\cdot 7=\frac{x+450}{7}\cdot 7](https://tex.z-dn.net/?f=77%5Ccdot%207%3D%5Cfrac%7Bx%2B450%7D%7B7%7D%5Ccdot%207)
![539=x+450](https://tex.z-dn.net/?f=539%3Dx%2B450)
![x+450=539](https://tex.z-dn.net/?f=x%2B450%3D539)
![x+450-450=539-450](https://tex.z-dn.net/?f=x%2B450-450%3D539-450)
![x=89](https://tex.z-dn.net/?f=x%3D89)
Therefore, Molly's score on the 7th math quiz was 89.
Answer:
5
Step-by-step explanation:
5 x 5 = 25
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
The correct answer is option B which is {x | x ≤ 4.5}
<h3>What is a number line?</h3>
A number line is a representation of a graduated straight line used to represent real numbers in introductory mathematics.
Because the arrow is pointing to the left, the answer to the solution set needs to be less than the number the dot is on.
A solid dot on a number means that that number is included in the solution set.
In the picture the solid dot is on 4.5, so the solution set needs to be equal to or less than 4.5.
Therefore the correct answer is option B which is {x | x ≤ 4.5}
To know more about number lines follow
brainly.com/question/4727909
#SPJ1
*radius is half diameter (or you can say) diameter is double of radius
* diameter is longer than the chord
*the longest chord is diameter