Question

A random sample of 25 students in a school shows that 6 have no siblings, 9 have 1 sibling, 8 have 2 siblings, and 2 have 3 or more siblings. About how many students would be expected to have at least 2 in a population of 225?

Answer 1

To estimate the number of students who would be expected to have at least 2 siblings in a population of 225, we can use the proportion of students in the sample who have 2 or more siblings as an estimate of the proportion in the population.

In the sample of 25 students, the proportion who have 2 or more siblings is:

(8 + 2) / 25 = 0.4

So, we can estimate that about 40% of the population would have 2 or more siblings.

To find the estimated number of students with at least 2 siblings in a population of 225, we can multiply the proportion by the population:

0.4 x 225 = 90

Therefore, we can estimate that about 90 students would be expected to have at least 2 siblings in a population of 225.