Question

Qian is among 12 students in a class. Three people will be chosen at random from the 12 to lead a group of 4. Find the probability that Qian will be chosen. Convert the fraction to a decimal.

Answer 1

There are 12 students in a class, Qian has already been chosen. Therefore, we have 11 students left in the class.

The formula for probability is given as,

`\text{Probability}=\frac{\text{Number of students}}{Total\text{ number of students}}`

Therefore, we have the probability of two students out of 11 students which were picked randomly to calculate.

The probability of picking the second person is,

`P(\text{second person)=}\frac{\text{2}}{11}`

The probability of picking the third person is,

`P(\text{third person)=}\frac{\text{1}}{10}`