Question

Use the two-way frequency table at the right to find the probability P(7th-grade boy).P(7th-grade boy) =(Simplify your answer.)

Answer 1

The total number of student is

`15+13+22=50`

The number of 7th-grade boys is

`=6`

The probability of 7th grade boys will be gotten using the formula

`Pr(7th\text{ grade boys)=}\frac{Number\text{ of 7th grade boys}}{\text{total number of students}}`

Thus, we will have

`Pr(7th\text{ grade boys)}=(6)/(50)=(3)/(25)`

Hence,

The total number of the students will be = 3/25