# Probability + percentages - math problems

#### Number of problems found: 51

- Events

Event P has probability of 0.84. What is the probability that the event P occurs in 3, 5, 7 try. - Event probability

The probability of event P in 8 independent experiments is 0.33. What is the probability that the event P occurs in one experiment (chance is the same)? - Shooter

The probability that a good shooter hits the center of the target circle I is 0.1. The probability that the target hit intercircle is II 0.58. What is the probability that it hits the target circle I or II? - Bulbs

The probability that the bulb can operate 4000 hours is 0.3. What is the probability that exactly one of eight bulbs can operate 4000 hours? - Two doctors

Doctor A will determine the correct diagnosis with a probability of 93% and doctor B with a probability of 79%. Calculate the probability of proper diagnosis if both doctors diagnose the patient. - Probability

How probable is a randomly selected three-digit number divisible by five or seven? - Doctors

The drug successfully treats 90% of cases. Calculate the probability that he will cure at least 18 patients out of 20? - Family

What is the probability that a family with 7 childrens have: exactly 5 girls? 7 girls and 0 boys? Consider the birth probability of a girl is 48.69% and boy 51.31%. - travel agency

Small travel agency offers 5 different tours at honeymoon. What is the probability that the bride and groom choose the same tour (they choose independently)? - Ace or king

What is the probability that we will choose an ace or a king when choosing from a deck of sevens cards? - Sum 10

What is the probability that two dice throw twice in a row will result the sum of 10? - Family

94 boys are born per 100 girls. Determine the probability that there are two boys in a randomly selected family with three children. - Three reds

What is the probability that when choosing 3 carats from seven carats, all 3 reds will be red? - Win in raffle

The raffle tickets were sold 200, 5 of which were winning. What is the probability that Peter, who bought one ticket will win? - Three colors

Find the probability that 3 balls of the same color will be drawn from fate with 10 white, 10 red, and 10 blue balls. - Prime number

Jan wrote any number from 1 to 20. What is the probability that he wrote the prime number? - Three dice

What is the probability that when we roll three dice, we roll the numbers 1,2,3? - Ace

From complete sets of playing cards (32 cards), we pulled out one card. What is the probability of pulling the ace? - Medicine

We test medicine on 6 patients. For all drug doesn't work. If the drug success rate of 20%, what is the probability that medicine does not work? - Two aces

From a 32 card box we randomly pick 1 card and then 2 more cards. What is the probability that last two drawn cards are aces?

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