Random or Biased
Population Inferences
Percents
Expressions & Equations
Miscellaneous
100
Chloe surveys only students who wear a UGA sweatshirt who they think should have made the conference games. Explain.
Biased -- only asked UGA fans
100
Mrs. Fouche surveyed students about their favorite color. She surveyed 30 random students in 7th grade.
- 8 said red
- 10 said blue
- the remainder said green
If there are 350 students in 7th grade, how many would you expect to say green?
140 students
100
The elves are preparing for Christmas morning. They typically make 1,200 presents a day. They have to increase 12% to make sure they are done in time. How many presents do they need to make today?
1,344 presents today
100
6 - (x - 8) = 9
x = 5
100
Irrational or Rational?
sqrt(81)
Rational because it is a perfect square
200
Mr. Harris wants to know if students would rather have hot chocolate or apple cider. He randomly chooses 15 students in 7th and 15 students in 6th grade.
Random -- he asked students from both grades, and found students randomly.
200
Coach Harrison flipped a coin 60 times. She landed of heads 25 of those times. If she flips the coin 300 times, how many times would you expect her to flip heads?
125 times
200
Ms. Miles has wrapped 25 presents. There are 5 red presents. What percent of her presents are wrapped in red wrapping paper?
16%
200
3(2x - 8) - 2(x - 10)
3(2x - 8) - 2(x - 10)
6x - 24 - 2x + 20
4x - 4
200
Sophia is saving money to buy a new computer. She currently has $120 saved, and she plans to save $15 each week. However, she also knows that she will need at least $300 to buy the computer. Let w represent the number of weeks she needs to save to have enough money. Write & solve the inequality.
120 + 15w >= 300
w >= 12
300
Mrs. Craven wants to know if students would rather watch "The Grinch" or "Polar Express". She asks five students from each of her class by drawing popcicle sticks.
Random -- she asked students from each class by drawing names.
300
Which of the following is true?
A. Team A has a more varied data set.
B. The teams have no data that overlaps.
C. The median for team B is the same as the maximum of team A.
D. In both teams, the IQR is 2.
D -- the IQR is 2 for both teams
300
In a community, there are 1,200 households. In a recent survey, it was found that 30% of the households have at least one pet, and 40% of the pet owners have more than one pet. How many households have more than one pet?
144 households
300
Samantha went to the store and bought a pair of shoes for $45. In addition to that, she also bought three t-shirts, each costing x. The total amount she spent was $93. Write the equation & solve.
45 + 3x = 93
$16 per shirt
300
5x - 8 + x = 2(___x - ____)
What number goes in the blanks to make this statement have NO SOLUTIONS?
3 & 4
400
The lunchroom wants to know if students would rather eat nachos or quesadilla for lunch Tuesday. She surveys the first 10 students to enter the lunch room.
Biased -- she didn't interview anyone from Soar Street or Eagle Avenue. In addition, she could have asked students who bring their lunch daily.
400
Myles has the following test scores:
85, 88, 92, and 97
What does he need to earn on the last test to have a 90 in math class?
88
400
On a cookie recipe, it says that it has 75% of your total daily sugar consumption. If each cooke has 12 grams of sugar, how many grams is recommended per day?
16 grams of sugar
400
4(2x - 7) = 6x + 4
8x - 28 = 6x + 4
2x =32
x = 16
400
A hiking team starts at 70 feet above sea level. They end up 30 feet below sea level. How far did the travel?
They descended 100 feet.
500
Landon wanted to know what the most popular game on GimKit was. He interviewed his friends that he knows loves "Don't look down".
Biased -- he asked students who he knows love that version of the game and noone else.
500
Ms. Crisp wants to know how many movies students have seen this week. She randomly surveyed students at EJMS. How many students would you expect to watch at least 3 movies this week if there are 600 students a EJMS?
9 / 20 = 270 students
500
Bella is working on surveying a percentage of students at EJMS. She surveyed 8% of our school body. If she surveyed 48 students, how many people are at the school in total?
600 Students
500
56 < 34 - x
x < 22
500
Simplify:
7^6 times 7^-9
1/7^3