IAR Grades 6-8 Statistics and Probability. Practice it free.

A fitness tracker recorded daily step counts, in thousands of steps, over $14$ days. The frequency table shows the results.
$\begin{array}{c|c} \text{Steps (thousands)} & \text{Number of days} \\ \hline 5 & 3 \\ 8 & 2 \\ 11 & 4 \\ 14 & 3 \\ 17 & 2 \end{array}$

What is the mean step count per day?

Students answered the statistical question "How many snacks did you pack?" The data are $3, 5, 7, 13$. What is the mean of the data?

Mia writes three survey questions:

• How many minutes do students in my class spend on homework?
• How many minutes did I spend on homework last night?
• How tall are the players on my team?

How many of the three are statistical questions?

A bookstore tracks five daily sales totals, in dollars: $10$, $15$, $20$, $25$, and $30$. A sixth day with sales of $20$ is added to the data set. How does this affect the mean?

Five afternoon temperatures, in degrees Fahrenheit, are $68\textsf{,}$ $72\textsf{,}$ $65\textsf{,}$ $74\textsf{,}$ and $71\textsf{.}$ What is the mean temperature?

Find the mode of the data set 4, 4, 7, 9, 10, 11.

Seven morning temperatures, in degrees Fahrenheit, are $58\textsf{,}$ $80\textsf{,}$ $70\textsf{,}$ $62\textsf{,}$ $72\textsf{,}$ $64\textsf{,}$ and $56\textsf{.}$ What is the median temperature?

A line of best fit for the number of lawns Jaden mows $x$ and his savings $y$ in dollars is $y = 15x + 40$. According to the line, how many dollars did Jaden have saved before mowing any lawns?