2.2 · Part II
Second Practice Form · Independent Application and Spiral Review
Display Data with Histograms · Histogram
- Set equal intervals along the horizontal axis with no gaps
- Count the frequency (how many data values fall into each interval)
- Draw adjacent bars with heights equal to frequency
- Display Data with Histograms (Representar datos con histogramas) — Group numerical data into intervals and show each interval's frequency with a bar.
- Histogram (Histograma) — A bar graph that groups data into equal ranges. The bars touch.
- Frequency (Frecuencia) — How many times a value shows up.
- Interval (Intervalo) — A range of numbers used to group data.
- Distribution (Distribución) — How the data is spread out.
- Variability (Variabilidad) — How spread out the numbers are.
- A common mistake in Display Data: Histograms is counting a boundary value in two intervals at once — for example, putting the value 10 in both the '0–9' bin and the '10–19' bin. Each data value belongs to exactly ONE interval. Before you submit, add up all your frequencies and check that the total matches the number of data values you started with.
-
1 MULTIPLE CHOICE
Two histograms show the SAME 40 test scores — one uses intervals of 5, the other intervals of 20. Which statement is true?
- AThe interval-of-5 histogram leaves some scores out
- BThe interval-of-5 histogram has more bars and shows more detail about the shape
- CThe interval-of-20 histogram has more bars
- DBoth histograms must look exactly the same
✏️ Workspace & Solution Steps -
2 MULTIPLE CHOICE
In a histogram, what does the height of each bar represent?
- AThe average of the data in that interval
- BThe range of the interval
- CThe median of the data
- DThe frequency (count) of data in that interval
✏️ Workspace & Solution Steps
-
3 GUIDED FILL
A histogram has interval counts 3, 5, 4. How many data values are represented?
- 1Add the bar frequencies: ___.
- 2Total data values: ___.
Final answer: -
4 GUIDED FILL
A histogram has interval counts 4, 6, 3. How many data values are represented?
- 1Add the bar frequencies: ___.
- 2Total data values: ___.
Final answer: -
5 MULTIPLE CHOICE
Frequencies: 0–9: 3, 10–19: 9, 20–29: 5, 30–39: 2. Which interval has the tallest bar?
- A20–29 with 5 players
- B0–9 with 3 players
- C30–39 with 2 players
- D10–19 with 9 players
✏️ Workspace & Solution Steps -
6 MULTIPLE CHOICE
A histogram shows these frequencies: 0–4: 3 players, 5–9: 8 players, 10–14: 12 players, 15–19: 5 players. How many players are represented in total?
- A20
- B15
- C28
- D12
per 1 -
7 MULTIPLE CHOICE
How is a histogram different from a regular bar graph?
- AThere is no difference
- BHistogram bars touch (no gaps) because the intervals are continuous ranges
- CHistograms use colors and bar graphs don't
- DBar graphs show numbers and histograms show words
✏️ Workspace & Solution Steps
Writing Task: Justify why your mathematical solution is accurate and complete.