bar graphs
a bar graph is another way of showing relationships between variables. a bar graph also contains an x - axis and a y - axis. but instead of points, a bar graph uses a series of columns to display data. see figure 3. on some bar graphs, the x - axis has labels rather than a numerical scale. this type of bar graph is used only to show comparisons.

use the bar graph in figure 4 to answer questions a through e below. be sure to include units when appropriate!

red blood cell count during human growth
bar graph with x - axis: birth, 2, 4, 6, 8, 10, 12 (months), 2, 4, 6, 8, 10, 12, 14+ (m), 14+ (f) (years); y - axis: average rbc count (million/mm³ of blood) from 4.5 to 5.7

figure 4

a. at birth, what is the average number of red blood cells per mm³ of blood? __________
b. what appears to happen to the number of red blood cells between birth and 2 months? ______________________________________________________
c. what happens to the number of red blood cells between the ages of 6 and 8 years? ______________________________________________________
d. between what ages is a human likely to have 4.6 million red blood cells? __________
e. after 14 years of age, do males or females have a higher red blood cell count? ______________________________________________________

Question

bar graphs
a bar graph is another way of showing relationships between variables. a bar graph also contains an x - axis and a y - axis. but instead of points, a bar graph uses a series of columns to display data. see figure 3. on some bar graphs, the x - axis has labels rather than a numerical scale. this type of bar graph is used only to show comparisons.

use the bar graph in figure 4 to answer questions a through e below. be sure to include units when appropriate!

red blood cell count during human growth
bar graph with x - axis: birth, 2, 4, 6, 8, 10, 12 (months), 2, 4, 6, 8, 10, 12, 14+ (m), 14+ (f) (years); y - axis: average rbc count (million/mm³ of blood) from 4.5 to 5.7

figure 4

a. at birth, what is the average number of red blood cells per mm³ of blood? __________
b. what appears to happen to the number of red blood cells between birth and 2 months? ______________________________________________________
c. what happens to the number of red blood cells between the ages of 6 and 8 years? ______________________________________________________
d. between what ages is a human likely to have 4.6 million red blood cells? __________
e. after 14 years of age, do males or females have a higher red blood cell count? ______________________________________________________

Accepted Answer

### Question A
# Explanation:
## Step1: Locate "Birth" on x - axis.
Find the bar corresponding to "Birth" in the bar graph.
## Step2: Read y - axis value.
The y - axis shows the average RBC count (million/mm³ of blood). The bar for "Birth" reaches up to 5.7 (by counting the grid or reading the scale).
# Answer:
5.7 million/mm³ of blood

### Question B
# Explanation:
## Step1: Locate "Birth" and "2 months" on x - axis.
Find the bars for "Birth" and "2 months" in the bar graph.
## Step2: Compare y - axis values.
The bar for "Birth" is at 5.7 and the bar for "2 months" is at 4.5 (approximate from the graph). So the number of red blood cells decreases.
# Answer:
The number of red blood cells decreases.

### Question C
# Explanation:
## Step1: Locate "6 years" and "8 years" on x - axis.
Find the bars for "6 years" and "8 years" in the bar graph.
## Step2: Compare y - axis values.
The bar for "6 years" and "8 years" (looking at the "Years" section, 6 and 8 years) have the same or very similar height (around 4.7 million/mm³), so the number of red blood cells remains relatively constant (or shows a small increase/decrease that is not significant, but from the graph, it looks stable).
# Answer:
The number of red blood cells remains relatively constant (or shows little change).

### Question D
# Explanation:
## Step1: Locate 4.6 million/mm³ on y - axis.
Find the value 4.6 on the y - axis (average RBC count).
## Step2: Find corresponding x - axis labels.
The bars that reach up to 4.6 million/mm³ are in the "Months" and "Years" section. Looking at the x - axis, around 12 months (1 year) to 8 years (by checking the bars: the bar at 12 months, 2 years, 4 years, 6 years, 8 years? Wait, no, looking at the graph, the bar for 12 months (end of months), 2 years, 4 years, 6 years? Wait, the x - axis has "Months" (2,4,6,8,10,12) and "Years" (2,4,6,8,10,12,14+). The bar for 12 months (in months) and 2 - 8 years? Wait, actually, looking at the graph, the bar at 12 months (end of months), 2 years, 4 years, 6 years, 8 years? Wait, no, the bar with height 4.6 is around 12 months (1 year) to 8 years? Wait, more accurately, from 12 months (1 year) to 8 years? Wait, the x - axis labels: after 12 months (which is 1 year), then 2 years, 4 years, 6 years, 8 years. The bar for 12 months (in months) and 2 - 8 years? Wait, the graph shows that the bar at 12 months (end of the "Months" group) and then 2 years, 4 years, 6 years, 8 years have a height of 4.6? Wait, no, looking at the graph, the bar for 12 months (in the "Months" section, last bar of months) and then 2 years, 4 years, 6 years, 8 years? Wait, the "Months" section has bars at 2,4,6,8,10,12 months. The "Years" section has 2,4,6,8,10,12,14+ years. The bar for 12 months (months) and 2 - 8 years (years) seem to have a height of 4.6. So the ages are from 12 months (1 year) to 8 years? Wait, no, the bar at 12 months (in months) is part of the "Months" group, and then 2 years, 4 years, 6 years, 8 years in the "Years" group. So the human is likely to have 4.6 million red blood cells between 12 months (1 year) and 8 years? Wait, more precisely, looking at the graph, the bars with height 4.6 are at 12 months (end of months), 2 years, 4 years, 6 years, 8 years? Wait, maybe from 12 months (1 year) to 8 years, or more accurately, between 1 year (12 months) and 8 years.
# Answer:
Between 1 year (12 months) and 8 years.

### Question E
# Explanation:
## Step1: Locate "14+ (M)" and "14+ (F)" on x - axis.
Find the bars for "14+ (M)" (males) and "14+ (F)" (females) in the bar graph.
## Step2: Compare y - axis values.
The bar for "14+ (M)" is taller than the bar for "14+ (F)", so males have a higher red blood cell count.
# Answer:
Males

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QUESTION IMAGE

Question

Explanation:

Question A

Step1: Locate "Birth" on x - axis.

Step2: Read y - axis value.

Step1: Locate "Birth" and "2 months" on x - axis.

Step2: Compare y - axis values.

Step1: Locate "6 years" and "8 years" on x - axis.

Step2: Compare y - axis values.

Answer:

Question B