Question

the table shows the results of a survey in which 10th - grade students were asked how many siblings (brothers and/or sisters) they have. what is the experimental probability that a 10th - grade student chosen at random has at least one, but no more than two, siblings? round to the nearest whole percent.

number of siblings	number of students
1	18
2	10
3	8

Explanation:

Step1: Calculate total students

$4 + 18+10 + 8=40$

Step2: Calculate students with 1 - 2 siblings

$18 + 10=28$

Step3: Calculate experimental probability

$\text{Probability}=\frac{28}{40}=0.7$

Step4: Convert to percentage

$0.7\times100 = 70\%$

Answer:

$70\%$