B3. The table contains data on the body length of newborns.

| Body length $\mathbf{v}$ cm | Number of newborns |
| :---: | :---: |
| over 40 to 44 | 1 |
| over 44 to 48 | 8 |
| over 48 to 52 | 13 |
| over 52 to 56 | 5 |

A For how many newborns are the data in the table collected?

B Estimate the average length of the newborns. Round the result to the nearest centimeter.

C Draw a bar chart (histogram) for the data collected in the table.

D What percentage of the newborns, whose data are collected in the table, are longer than $48 \mathrm{~cm}$?
B3. In the table, there are $1+8+13+5=27$ newborns.

B The midpoints of the frequency classes are $42, 46, 50$, and $54$, so we can estimate the average length of the newborns: $\frac{42+8 \cdot 46+13 \cdot 50+5 \cdot 54}{27}=\frac{1330}{27} \doteq 49$.

![](https://cdn.mathpix.com/cropped/2024_06_07_7876a7df18fe8c6add15g-6.jpg?height=671&width=1257&top_left_y=221&top_left_x=251)

D The length of $48 \mathrm{~cm}$ is exceeded by $13+5=18$ newborns, which is $\frac{18}{27}=\frac{2}{3} \doteq 66.7 \%$.

In the table, there are 27 newborns. 1 point

Calculated midpoints of the frequency classes 1 point

Estimate for the average length of the newborns: 49 2 points

Graphical representation: 2 points

The length of $48 \mathrm{~cm}$ is exceeded by approximately $66.7 \%$ of the newborns 1 point