B1. The table shows the number of mobile phones sold $\mathrm{v}$ in a week.

| Brand | Monday | Tuesday | Wednesday | Thursday | Friday |
| :--- | ---: | ---: | ---: | ---: | ---: |
| Samsung | 10 | 14 | 1 | 3 | 12 |
| HTC | 2 | 15 | 8 | 12 | 2 |
| LG | 2 | 4 | 0 | 0 | 3 |
| Apple | 1 | 0 | 3 | 6 | 2 |

A. Which brands of phones were sold the most in this week?

B. How many phones were sold on average per day $\mathrm{v}$ in this week?

C. Illustrate the weekly sales of Samsung phones with a pie (circular) chart.
B1. The most sold phones were of the Samsung brand. In five days, 100 phones were sold, or on average 20 per day. To display the data with a pie chart, we create the following table:

|  | Samsung | Rel. freq. [\%] | Central angle [ ${ }^{\circ}$ ] |
| :--- | ---: | ---: | ---: |
| MON | 10 | 25 | 90 |
| TUE | 14 | 35 | 126 |
| WED | 1 | 2.5 | 9 |
| THU | 3 | 7.5 | 27 |
| FRI | 12 | 30 | 108 |
| $\Sigma$ | 40 | 100 | 360 |

![](https://cdn.mathpix.com/cropped/2024_06_07_2a119673c0ca3587e23fg-11.jpg?height=443&width=539&top_left_y=321&top_left_x=1318)

A. The most Samsung devices were sold ....................................... $1 \mathbf{t}$

B. The average sales per day are 20 phones ........................................... 2 t

C. Calculated central angles in the pie chart. .......................... 1 t

Correctly drawn central angles................................................................................................

Drawn pie chart with appropriate legend. ...................................... 2 t