Question

There are 25 students in a 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

Answer 1

Answer:

  3 5/26

Step-by-step explanation:

You can work this a couple of ways.

1. Find the total number of siblings for the current students (25×3), add the new number of siblings (8) and students (1), then recompute the average.

  (25×3 + 1)/(25 +1) = 83/26 = 3 5/26

___

2. Find the difference of the number of siblings from average, and divide that difference by the new total number of students. This will be the change in the average.

  difference from average = 8 -3 = 5

  difference divided by new student total = 5/26

  new average = 3 + 5/26 = 3 5/26