Question

A study of 1000 randomly selected flights of a major airline showed that 782 of the flights arrived on time. What is the probability of a flight from this airline arriving on time?

Answer 1

Task. A study of 1000 randomly selected flights of a major airline showed that 782 of the flights arrived on time. What is the probability of a flight from this airline arriving on time?

Solution. Let $N=1000$ be the number of selected flights and $k=782$ be the number of flights among $N$ arrived in time. Then the probability of a flight from this airline arriving on time is equal to

$p=\frac{k}{N}=\frac{782}{1000}=0.782.$

Answer. $p=0.782.$