Probability

A box contains 6 white marbles and k black marbles. If a marble is picked randomly from the box, the probability of getting a black marble is 0.625. Find the value of k.

The probability that Hamid qualifies for the final of a track event is 0.25 while the probability that Mohan qualifies is 0.64. Find the probability that both of them qualifies for the final.

0.085

0.16

0.27

0.48

The probability of Sarah being chosen as a school prefect is 0.85 while the probability of Aini being chosen is 0.2. Find the probability that only one of them is chosen as a school prefect.

0.03

0.29

0.68

0.71

The probability that a student is a librarian is 0.2. Three students are chosen random. Find the probability that only two of them are librarians.

0.008

0.032

0.096

0.128

The probabilities that three teams, P, Q and R, win a football match are 0.25, 0.2 and 0.1 respectively. Calculate the probability that team P or Q wins the football match.

0.045

0.18

0.35

0.45

Probability

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