by BlastRoom
Using one minus the probability of the opposite, especially where at least one is asked for.
#probability_and_statistics

40 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
Answer to place stones and capture territory.
Outrun the snow together.
Earn blasts, then hunt the other team.
Answer to earn energy, then climb.

The class blasts through walls together.
Bid on mystery lots. Most money wins.
Sell tours. Nice, standard, or a total scam.
Answer, restock, and serve the rush.
More correct answers pulls the rope your way.
Answer, then shoot down the alien wave.
Answer, then tap to leap the frozen ridge.
In a city bike-share study, the probability that a randomly chosen trip lasts longer than 20 minutes is . Find the probability that the trip lasts 20 minutes or less, as a decimal to three places.
At a clinic, the probability that a randomly selected appointment starts late is . What is the probability that the appointment does not start late, as a decimal to three places?
A school survey finds that the probability a student prefers online registration is . Find the probability a student does not prefer online registration, as a decimal to three places.
On a factory line, the probability that a randomly chosen bottle passes inspection is . Find the probability that it fails inspection, as a decimal to three places.
For a soccer league, the probability that a goalie saves a penalty kick is . What is the probability that the goalie does not save the kick, as a decimal to three places?
A farmer reports that the probability a planted seed germinates is . Find the probability that a seed does not germinate, as a decimal to three places.
A transit agency says the probability that a bus arrives before 7:45 is . Find the probability that the bus arrives at 7:45 or later, as a decimal to three places.
For a school app, the probability that a randomly selected user enables notifications is . Find the probability that the user does not enable notifications, as a decimal to three places.
A library finds the probability that a checked-out book is returned on time is . What is the probability that a checked-out book is not returned on time, as a decimal to three places?
At a science fair, the probability that a project uses recycled materials is . Find the probability that a project does not use recycled materials, as a decimal to three places.
A club has 50 colored pins: 12 red, 18 blue, and 20 green. One pin is chosen at random. Find the probability that the pin is not blue, as a fraction in lowest terms.
A greenhouse has 64 plants: 15 tomatoes, 21 peppers, and 28 beans. One plant is selected at random. Find the probability that the plant is not a pepper, as a fraction in lowest terms.
A theater sells 45 tickets: 9 adult, 24 student, and 12 senior. One ticket is picked at random. What is the probability that it is not a student ticket, as a fraction in lowest terms?
A lab records 80 samples: 22 acidic, 34 neutral, and 24 basic. One sample is chosen at random. Find the probability that the sample is not neutral, as a fraction in lowest terms.
A track team has 36 athletes: 8 sprinters, 10 jumpers, and 18 distance runners. One athlete is chosen at random. Find the probability that the athlete is not a jumper, as a fraction in lowest terms.
A commuting survey has 90 responses: 27 bus, 33 car, and 30 walk. One response is selected at random. Find the probability that the response is not car, as a fraction in lowest terms.
An art show has 56 entries: 14 paintings, 18 photos, and 24 sculptures. One entry is chosen at random. Find the probability that the entry is not a photo, as a fraction in lowest terms.
A survey has 75 answers to a proposal: 15 yes, 45 no, and 15 maybe. One answer is chosen at random. What is the probability that the answer is not no, as a fraction in lowest terms?
A library cart holds 42 books: 11 fiction, 17 nonfiction, and 14 graphic novels. One book is picked at random. Find the probability that the book is not nonfiction, as a fraction in lowest terms.
A field trip survey has 84 choices: 21 bus, 35 car, and 28 bike. One choice is selected at random. Find the probability that the choice is not bus, as a fraction in lowest terms.
An inspector checks 5 bolts independently from a large bin where each bolt has probability of being defective. Find the probability that at least one checked bolt is defective, as a decimal to three places.
A teacher emails 4 families independently, and each email has probability of getting a reply that day. Find the probability that at least one family replies that day, as a decimal to three places.
A class plants 3 seeds independently, and each seed has probability of sprouting. Find the probability that at least one seed sprouts, as a decimal to three places.
A login attempt has probability of failing, independently of other attempts. For 6 attempts, find the probability that at least one attempt fails, as a decimal to three places.
At an outdoor practice, each day independently has probability of rain. Over 4 practice days, find the probability that it rains on at least one day, as a decimal to three places.
A chip from a production line has probability of having a flaw, independently. If 10 chips are tested, find the probability that at least one has a flaw, as a decimal to three places.
A basketball player has probability of making each free throw, independently. For 2 free throws, find the probability that the player makes at least one, as a decimal to three places.
A bus ride has probability of being delayed, independently of other rides. For 5 rides, find the probability that at least one ride is delayed, as a decimal to three places.
A student types a password correctly with probability on each independent try. For 3 tries, find the probability that the password is typed correctly at least once, as a decimal to three places.
At a fundraiser, each visitor independently has probability of donating. For 4 visitors, find the probability that at least one visitor donates, as a decimal to three places.
A lab vial has probability of being contaminated, independently of other vials. For 8 vials, find the probability that at least one is contaminated, as a decimal to three places.
A monitoring system independently sends an alert with probability each hour. Over 7 hours, find the probability that at least one alert is sent, as a decimal to three places.
For a randomly chosen flight, event D is that the flight arrives more than 15 minutes after its scheduled time. Which event is the complement of D?
For a randomly chosen plant, event R is that the plant is at least 30 cm tall. Which event is the complement of R?
For one basketball player, event M is that the player makes all 4 free throws. Which event is the complement of M?
For a sampled water bottle, event C is that the bottle contains 500 mL or more. Which event is the complement of C?
On a spinner, event S is that the pointer lands on red or blue. Which event is the complement of S?
For a student attendance record, event T is that the student is absent exactly 2 days in a month. Which event is the complement of T?
For a randomly chosen package, event G is that the package weighs under 2 kg. Which event is the complement of G?
For a storage case, event L is that the temperature is from 2 °C to 8 °C inclusive. Which event is the complement of L?
Crack the passcode before the zombies get in.
Answer, then swat bugs for bonus points.
Race through questions at your own speed.
Same question on every screen. Fastest wins.

Pick a tile, answer, hit bonuses and steals.
Venn Diagrams
40 questions