Unit E: Statistics and Probability

Chapter 1: Statistics

Practice

Instructions: Click the Download File button to download a printable PDF of the questions. Answer each of the following practice questions on a separate piece of paper. Step by step solutions are provided under the Solutions tab. You will learn the material more thoroughly if you complete the questions before checking the answers.

Practice
Solutions

Blue Morpho butterflies have blue on the top side of their wings and a brown pattern on the bottom.

Lacewing butterflies have wings that are orange, white, and black.

There are a total of 15 butterflies in the picture. What percent of the butterflies are lacewing butterflies?
There are nine chocolates in a box. Three out of the nine chocolates contain only dark chocolate.

What percent of the chocolates contain only dark chocolate?

Blue Morpho butterflies have blue on the top side of their wings and a brown pattern on the bottom.

Lacewing butterflies have wings that are orange, white, and black.

There are a total of 15 butterflies in the picture. What percent of the butterflies are lacewing butterflies?

Of the 15 butterflies, 6 are lacewing.

\begin{array}{rcl} % & = & \frac{number of values selected}{total number of values} \times 100 % \\ = & \frac{6}{15} \times 100 % \\ = & 0.40 \times 100 % \\ = & 40 % \end{array}

Therefore, 40% of the butterflies in the picture are Lacewing butterflies.

There are nine chocolates in a box. Three out of the nine chocolates contain only dark chocolate.

What percent of the chocolates contain only dark chocolate?

\begin{array}{rcl} % & = & \frac{number of values selected}{total number of values} \times 100 % \\ = & \frac{3}{9} \times 100 % \\ = & 0.333 \times 100 % \\ = & 33.3 % \end{array}

Therefore, 33.3% of the chocolates in the box contain only dark chocolate.