Answer:
Name: ________________________ Class: ___________________ Date: __________ ID: A
Math 9 - Chapters 8 and 9 Review
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Solve the following: 5s 4 22.
a. s=2.4
b. s=3.6
c. s=18
d. s=22
2. Solve 7.2 b 6.4 43.12.
a. b=5.1
b. b=6.88
c. b=13.6
d. b = 29.52
3. Solve 4.6(2.5a 2) 6.9.
a. a=1.4
b. a=2.76
c. a=23.0
d. a=3.56
4. Solve 2.3t 5t 9.99.
a. t = –1.37
b. t=1.37
c. t=3.7
d. t=4.34
6.
7.
8.
Brenda got a mark of 18 on her test. This mark was equal to 72%. How many marks was the test worth?
a. 24
b. 25 c. 30 d. 100
Anapplehas5mgofvitaminC.Abananahas2 mg more than twice the amount of vitamin C of an apple. If an orange has 3.5 times as much vitamin C as a banana, how much vitamin C does an orange have?
a. 7mg
b. 12mg
c. 24.5 mg
d. 42mg
The statement “The boy appears to be at least 10 years old” can be represented by the inequality a. a10
b. a10
c. a10 d. a10
Which inequality represents the statement, “The pilot was less than 1.9 m tall”?
a. h1.9
b. h1.9
c. h1.9 d. h1.9
4 1
5. Solve5w4.813.24w. 9.
a. w=8
b. w=8.4
c. w=16
d. w=18
10. Express the inequality algebraically.
a. x12 b. x12
c. x12 d. x12
1
Step-by-step explanation:
Answer:
13 cm
Step-by-step explanation:
Add up all of the sides and you should get 13.
3 + 3 + 3.5 + 3.5 = 13
So mean is pretty easy to calculate; you just add everything up and divide by the number of things you added. Variance is pretty tricky because it involves subtracting the mean from each number, squaring that, adding all of the numbers up, and then dividing by the number of things. Then standard deviation is just the square root of the variance. Although some might enjoy spending hours figuring these out (I actually had to take a class where we only did this and stuff like it), most of us who use statistical tests do not want to waste our time on it. It is for that reason that there are websites that will compute all of these and all you have to do is put in the numbers. A pretty good one is:
http://www.calculator.net/standard-deviation-calculator.html
This one will calculate these and almost any other tests you need.
Now to your problem, if we add all of them up and divide by N (the # of things added), then we will get a mean of (μ=$5.10). From this, we can do further descriptive statistics. Standard Variance of the sample was calculated to (s^2=0.254). If we take the square root of the variance, we get a standard deviation of (s=0.504). I hope that this helps you with this problem and I hope that I helped for future problems by introducing the variance and standard deviation calculator to you!
The first one is the Last choice, and the second one is the third choice! please mark as brainliets
Answer:
The third answer aka C
Step-by-step explanation:
