There are 25 students in mrs. venetozzi’s class at the beginning of the school year, and the average number of siblings for each student is 3. a new student with 8 siblings joins the class in november. what is the new class average for number of siblings? round your answer to the nearest hundredth.

The new class average for number of siblings is 3.19

Initially the number of students was 25:
n1=25
And the average number of siblings for each student is 3
avg1=3
avg1=T1/n1
where the total number of siblings: T1
Replacing in the equation of avg1 the known values:
3=T1/25
Then, we can solve for T1: Multiplyng both sides of the equation by 25:
25(3)=25(T1/25)
75=T1
T1=75
Initially the total number of siblings was 75

A new student with 8 siblings joins the class in November:
The number of students will be: n2=n1+1=25+1→n2=26
And the total number of siblings will be: T2=T1+8=75+8→T2=83

What is the new class average for number of siblings? Round your answer to the nearest hundreth:
avg2=T2/n2=83/26=3.192307692
Rounded to the nearest hundreth:
avg2=3.19

The new class average for number of siblings is 3.19