Step: 1

From the graph, as the demand of an item rises, there is a rise in the price of the item and as the demand reduces there is a decrease in the price of an item.

Step: 2

If one set of data tends to increase with an increase in the other set, the plot is said to have a positive trend.

Step: 3

So, the scatter plot shows a positive trend.

Correct Answer is : Positive trend

Step: 1

The vertical coordinate of each point in the scatterplot represents Andrew's height and the horizontal coordinate represents his age.

Step: 2

From the graph, the vertical coordinate of the point corresponding to 15 years is 5 ft.

Step: 3

So, Andrew was 5 ft tall when he was 15 years old.

Correct Answer is : 5 ft

Step: 1

The vertical coordinate of each point on the scatter plot indicates the distance traveled by Diane during each hour.

Step: 2

The distance traveled in the first hour of the journey is 50 km.

Step: 3

The distance traveled in the second hour is 55 km.

Step: 4

The distance covered in third hour is 52.5 km. as it is in between 50 and 55.

Step: 5

The total distance covered in the first three hours of the journey = 50 + 55 + 52.5 = 157.5 km.

[Add.]

Step: 6

The distance traveled by Diane in 3 hours is 157.5 km.

Correct Answer is : 157.5 km

Step: 1

The height of each point on the scatter plot indicates the number of items of a particular cost bought by Lindsay.

Step: 2

From the graph, the number of items of costs $2, $4, $6, $8 and $10 are 3, 5, 3, 2 and 3 respectively.

Step: 3

The total amount spent by her is the sum of the products of the number of items and the cost of each item.

Step: 4

So, the total amount = $2 x 3 + $4 x 5 + $6 x 3 + $8 x 2 + $10 x 3

= 6 + 20 + 18 + 16 + 30 = $90

[Multiply number of items and cost of each item and add all.]

Step: 5

So, Lindsay spent $90 in the supermarket.

Correct Answer is : $90

Step: 1

The height of each point in the plot represents the contribution made in that particular year.

Step: 2

The height of the point corresponding to the 1^{st} year represents the value $1000, which is the least.

Step: 3

So, the minimum contribution made to the orphanage was $1,000.

Correct Answer is : $1,000

Step: 1

The height of each point in the scatter plot gives the distance traveled by Victor at the particular speed in the time.

Step: 2

From the graph, Victor can travel 150 miles in the time if he travels at 70 mph.

Step: 3

Victor can travel 190 miles in the time if he travels at 80 mph.

Step: 4

Difference between the distances = 190 - 150 = 40

[Subtract 150 from 190.]

Step: 5

So, Victor can travel 40 more miles in the time if he travels at 80 mph than that when he travels at 70 mph.

Correct Answer is : 40

Step: 1

The height of each point in the plot represents the population of a particular state in a particular year.

Step: 2

From the plot, the population of Alabama in the year 1999 is 4 million.

Step: 3

The population of Alabama in the year 2002 is 8 million.

Step: 4

Increase in the population = 8 - 4 = 4 million

[Subtract 4 from 8.]

Step: 5

So, the percentage increase in the population = Increase Original x 100

= 4 4 x 100 = 100%

[Divide.]

Correct Answer is : 100%

Step: 1

In the scatter plot, the horizontal axis represents Charles's age and the vertical axis represents his weight in lb.

Step: 2

The vertical distance of each point in the scatter plot indicates the weight of Charles when he was a particular age.

Step: 3

From the graph, the vertical distance of the point corresponding to 30 is 125.

Step: 4

So, the weight of Charles was 125 lb when he was 30 years old.

Correct Answer is : 125

Step: 1

In the scatter plot, the horizontal axis represents Jeff's age and the vertical axis represents his weight in lb.

Step: 2

The vertical distance of each point in the scatter plot indicates the weight of Jeff when he was a particular age.

Step: 3

From the graph, the vertical distance of the point corresponding to 20 is 100.

Step: 4

So, Jeff's weight was 100 lb. when he was 20 years old.

Correct Answer is : 20

Step: 1

The height of each point in the graph indicates the income (in $1000) of the dealer in the corresponding year.

Step: 2

From the graph, the incomes of the dealer in 1985, 1990, 1995 and 2000 are $40000, $45000, $35000 and $50000, respectively.

Step: 3

The income of the dealer was the highest in 2000.

Correct Answer is : 2000

Step: 1

In the scatter plot, the horizontal axis indicates the year and the vertical axis indicates the income (in $1000) earned by the wholesale dealer.

Step: 2

The height of each point in the graph indicates the income (in $1000) of the dealer in the particular year.

Step: 3

From the graph, the vertical coordinate of the point corresponding to the year 2000 is 50.

Step: 4

So, the income of the wholesale dealer in 2000 was $50,000.

Correct Answer is : $50 thousands

Step: 1

The height of each point in the scatter plot indicates the yield of the apple orchard in the corresponding year.

Step: 2

From the scatter plot, the number of apples in the year 1985 = 700

Step: 3

Number of apples in the year 1990 = 800

Step: 4

Increase in the number of apples

= 800 - 700 = 100

[Subtract.]

Correct Answer is : 100

Step: 1

The vertical coordinate of each point on the scatter plot indicates the consumption of goods (in million tons) in the corresponding year.

Step: 2

From the plot, the consumption of the goods in 1999 was 35 million tons.

Step: 3

The consumption of the goods in the year 2000 is 25 million tons.

Step: 4

So, the ratio of the consumption of goods in 1999 to that in 2000 = 35 : 25 = 7 : 5

Correct Answer is : 7 : 5

Step: 1

Number of matches won in 1988 = 70

Step: 2

Number of matches won in 1989 = 45

Step: 3

Number of matches won in 1990 = 65

Step: 4

Total number of matches won by USA from 1988 to 1990 = 70 + 45 + 65 = 180

Step: 5

So, the total number of matches won by USA from 1988 to 1990 is 180.

Correct Answer is : 180

Step: 1

Each point in the scatter plot shows the test score of a student who studied for the respective number of hours.

Step: 2

Draw a vertical line starting from 10 hours in the scatter plot. This line intersects the trend line at a point.

Step: 3

From the intersection, draw a horizontal line that intersects the y-axis. This intersection point on the y-axis gives the required test score as the y-axis represents the test scores.

Step: 4

So, a student who studied for 10 hours would have scored about 68 points

Correct Answer is : 68

- Finding Intercepts of Linear Relations-Gr 8-Solved Examples
- Slope of a Line from its Graph-Gr 8-Solved Examples
- Constructing Scatter Plots-Gr 8-Solved Examples
- Scatter Plots Line of Best Fit and its Correlations-Gr 8-Solved Examples

- Data