# Combinatorics - math word problems - page 39 of 40

#### Number of problems found: 792

- Sales

From statistics of sales goods, item A buy 51% of people and item B buys 59% of people. What is the probability that from 10 people buy 2 item A and 8 item B? - Doctors

The drug successfully treats 90% of cases. Calculate the probability that he will cure at least 18 patients out of 20? - Probability 30271

The probability of an adverse drug reaction is 2.1%. How many people need to be prescribed for one patient to experience side effects with a chance of 90%? - Family

94 boys are born per 100 girls. Determine the probability that there are two boys in a randomly selected family with three children. - Instructions 10282

Find out if two people in Bratislava have the same number of hairs on their heads. Instructions. Bratislava has about 420,000 inhabitants, and a person has less than 300,000 hairs on his head. - Probability 73054

We roll six dice. What is the probability that: a) a six falls twice b) six falls four times - Left handed

It is known that 25% of the population is left-handed. What is the probability that there is a maximum of three left-handers at a seminar where there are 30 participants? - Dice

We throw five times the dice. What is the probability that six fits exactly twice? - Probability 7628

The probability that six will fall in just three rolls is once? - Circles

How many different circles are determined by 9 points at the plane if 6 of them lie in a straight line? - Drinks

In a country 65% of people drink coffee 50% drink tea 25% drink both. What is the probability that a person chosen at random will drink neither tea nor coffee? - Birthday paradox

How large must the group of people be so that the probability that two people have a birthday on the same day of the year is greater than 90%? - Double probability

The probability of success of the planned action is 60%. What is the probability that we will achieve success at least once if this action is repeated twice? - TV fail

The TV has average 35 failures after 10,000 hours. Find the probability of TV failure after 400 hours of operation. - Alarm systems

What is the probability that at least one alarm system will signal the theft of a motor vehicle when the efficiency of the first system is 90% and of the independent second system 80%? - The university

At a certain university, 25% of students are in the business faculty. Of the students in the business faculty, 66% are males. However, only 52% of all students at the university are male. a. What is the probability that a student selected at random in the - Three shooters

Three shooters shoot, each one time, on the same target. The first hit the target with a probability of 0.7; second with a probability of 0.8 and a third with a probability of 0.9. What is the probability to hit the target: a) just once b) at least once c - Family

What is the probability that a family with 3 childrens have: exactly 1 girl? 3 girls and 0 boys? Consider the birth probability of a girl is 48.61% and boy 51.39%. - Probability 71174

Find the probability that one will fall at least once in three rolls. - All use computer

It is reported that 72% of working women use computers at work. Choose 3 women at random, find the probability that all 3 women use a computer in their jobs.

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