Question

A school administrator wants to know the average age of the 25,000 kindergarteners in her state at the beginning of the school year. she randomly selects 1,000 kindergarteners in the state, assuring that the group accurately represents all kindergarteners in the state, and finds the average age to be 5 years 10 months. what assumption can she make regarding the approximate average age of all kindergarteners in the state?

1. The correct option is B. The approximate average age of kindergarteners in the state is 5 years 10 months.

### What is assumption?

The Assumption Method (also known as that of the Supposition Method) would be a Singapore Math problem-solving method in which you assume an extreme condition to solve a problem that you may otherwise solve using the Guess and Check method.
The working of assumption is based upon following factors;
• We begin by forming an assumption / guess about something (see how Guess and Check approach is related to the Assumption?).
• Then, step by step, we’ll derive what we understand and how it relates to the math equation until we’ve solved the problem.
• Before we get started with the Assumption Method, let’s talk about how to figure out what kinds of questions we can use it to address.
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The complete question is-
Select the correct answer. A school administrator wants to know the average age of the 25,000 kindergarteners in her state at the beginning of the school year. She randomly selects 1,000 kindergarteners in the state, assuring that the group accurately represents all kindergarteners in the state, and finds the average age to be 5 years 10 months. What assumption can she make regarding the approximate average age of all kindergarteners in the state?
A. The approximate average age of kindergarteners in the state is less than 5 years 10 months.
B. The approximate average age of kindergarteners in the state is 5 years 10 months.
C. The approximate average age of kindergarteners in the state is greater than 5 years 10 months.
D. No assumptions can be made regarding the average age of kindergarteners in the state because the sample is biased.