Sampling & Predictions
A principal surveyed 60 students and 45 said they prefer pizza. If the school has 600 students, how many likely prefer pizza?
450
What is the chance of rain if the forecast says 20%?
unlikely
On a spinner labeled 1–10, what is the probability of spinning an 8?
1/10
Mrs. McCall graded the following quizzes: 82, 87, 85, 90, 86.
What is the mean score?
86
What grade comes after 7th grade?
8th
What does increasing the sample size of a survey do to the results?
Increases the reliability/validity of the results
A bag has 10 red, 15 blue, and 5 green marbles. What is the probability of picking a green one?
5 out of 30 or 1/6
What is the probability of spinning an even number (2, 4, 6, 8, 10)?
5/10 or 1/2
5, 5, 6, 7, 5, 8, 6.
What is the mode?
5
What’s one thing students can do the night before a test to help them be more successful?
a) Stay up all night studying
b) Eat a bag of chips and play video games
c) Get a good night’s sleep
d) Skip school the next day
c) Get a good night’s sleep
You want to know how many students ride the bus. Which sample is unbiased?
a) 4 in the hallway
b) Soccer team
c) Every 15th student at lunch
d) 50 random seniors
c) Every 15th student at lunch
Mrs. McCall gave out 3 blue, 5 yellow, 4 purple, 2 red, and 7 green erasers. What is the probability of getting a blue next?
3 out of 21 or 1/7
What is the probability of spinning a letter on a spinner labeled with only numbers?
0 - impossible
9, 10, 10, 8, 7, 10, 9
What is the median
9
Mrs. McCall is packing for summer break. She brings sunscreen, a beach towel, a book, and… math flashcards?! What’s a fun way to keep your brain active over summer break?
Play educational games, do puzzles, or read for 20 minutes a day... (answers vary)
A researcher tags 50 fish and recaptures 10 tagged out of 200. Estimate the lake’s fish population.
1000 fish
If Mr. Ivester rolls a number cube 600 times, about how many times will he roll a 3 or a 6?
About 200 times
What is the probability of spinning a 2, 3, or 6 on a 1–10 spinner?
3/10
Test scores in one class period were:
75, 80, 82, 90, 88, 93
What is the range of the scores?
18
(93 - 75)
You’re stuck on a test question you don’t know. What’s the best strategy?
a) Panic
b) Leave it blank
c) Make your best guess and come back to it later
d) Stare at it until time runs out
c) Make your best guess and come back to it later
A middle schooler gives a survey result of “10” on a scale of 1 to 10 when most responses are 6–8. Why would this be surprising?
10 is an outlier
In a class of 15 students with hoodies and 10 without, what is the probability Mr. Ivester randomly chooses a student wearing a hoodie?
15 out of 25 or 3/5
A survey for an online game should be placed where to get the best data?
a) End of a level
b) Beginning
c) Gaming store flyer
d) On a separate website
End of a level
Mrs. McCall recorded the number of minutes her students spent on a math game:
12, 15, 15, 10, 18, 20, 10, 14
What are the mean, median, mode, and range?
mean = 14.25
median = 14.5
mode = 10 and 15 (bimodal) or 12.5
range = 10
It’s the last day of school and you’ve finished your 7th grade math final. What’s something you can reflect on to help you grow in 8th grade math?
Think about what topics were hardest for you, what helped you learn best (like group work, visuals, or games), and set a small goal for next year—like practicing fractions or staying organized... (answers vary)