### Home > CC3 > Chapter 7 > Lesson 7.1.3 > Problem 7-30

a.

b.

c.

Make a graph of Team 2’s data from problem 7-25.

*7-30 HW eTool*(Desmos). Homework Help ✎Draw a

*straight*line that models the trend of the data on this graph. Remember, the line does not need to intersect each of the points.Use your line of best fit to predict the height of the plant when the seed is planted 14 cm deep.

What is the

*y*‑intercept? Interpret the*y*‑intercept in this situation.

**Day****Attendance**1

870

2

940

3

731

4

400

5

861

6

680

7

593

During a given week, the museum had attendance as shown in the table at right.

*7-31 HW eTool*(CPM).Numerically summarize the center and spread of attendance by finding the median and interquartile range (IQR).

The museum management needs to tell the staff members their work schedules a week in advance. The museum wants to have approximately one staff member for every 150 visitors. How many staff members should be scheduled to work each week? Explain your reasoning.

Why is a scatterplot

*not*an appropriate display of this data?

Remember that a line of best fit has about the same number of points above and below the line.

If you were to draw a horizontal line from the line of best fit to the *y*-axis, where would it cross?

Where does the line of best fit cross the *y*-axis?

The *y*-intercept is how tall we can expect the plant to grow if it is planted on the surface.

Complete the table in the eTool below to help solve this problem.

Click the link at right for the full version of the eTool: *CC3 7-30 HW eTool*