3.2.1 Reflection & Practice: (Pages 40-41)

Front

What is the result of multiplying a number by 0.1?

Back

Multiplying a number by 0.1 shifts the decimal point one place to the left. For example, 21 x 0.1 = 2.1.

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the whole population. It is often used when surveying is impractical.

Front

Evaluate: 0.021 x 100 = ?

Back

2.1

Front

What is the purpose of surveying a sample of students for a fundraiser?

Back

Surveying a sample helps to gather data about preferences without needing to ask every student, making it more efficient.

Front

Evaluate: 0.000021 x ____ = 2.1

Back

100,000

Front

Evaluate: 0.21 x 10 = ?

Back

2.1

Front

How do you predict the number of students favoring a sport based on a survey?

Back

Use the ratio from the survey to estimate for the larger population. For example, if 10 out of 30 students like soccer, then 450 students would have approximately 150 liking soccer.

Front

What is the formula to find the percentage of a group?

Back

Percentage = (Part/Whole) x 100.

Front

What does it mean to evaluate an expression?

Back

Evaluating an expression means calculating its value based on the numbers and operations involved.

Front

What happens to a number when it is multiplied by 10?

Back

Multiplying a number by 10 shifts the decimal point one place to the right. For example, 0.21 x 10 = 2.1.