Data & Statistics STAAR Review

The ages in years of the participants in a piano recital are 10, 12, 9, 13, 10, and 11. What is the mean age of the participants? Round to the nearest whole number.

(a)  

Answer explanation

The mean age of the participants is 10.8 years. This is calculated by adding up all the ages and dividing by the number of participants (6). 10 + 12 + 9 + 13 + 10 + 11 = 65. 65 / 6 = 10.8.

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6.12C

The box plot shows the number of homework problems Beth had daily in math the last six weeks. What is the interquartile range of the data shown in the box plot?

​ (a)  

• 5
• 13
• 9
• 8

Answer explanation

The interquartile range of the data shown in the box plot is 5, as it is the difference between the upper quartile (18) and the lower quartile (13).

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6.12C

The following are Leroy's test scores for the last grade period.

79, 81, 82, 84, 86, 90

What is the range in Leroy's test scores?

(a)  

Answer explanation

The range in Leroy's test scores is 11, which is calculated by subtracting the lowest score (79) from the highest score (90).

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6.12C

Given the numbers from 1-10, eleven students in Pat's class were asked to select their favorite. Their responses are listed in the dot plot.

The mode of the date is ​ (a)   ,the median is ​ (b)   , and the range is ​ (c)   . The shape of the data is ​ (d)  

• 4
• 6
• symmetrical
• 5
• asymmetrical

Answer explanation

Mode: 4 because it is the most repeated

Median: 4 because it is the middle value of the set

Range: 6 (7-1)

The shape is symmetrical because it looks the same on both sides.

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6.12C

The stem and leaf plot shows the number of minutes it takes a company's employees to drive to work each morning.

The range of the data is ​ (a)   and the median is ​ (b)   .

• 42
• 31
• 28
• 40
• 32

Tags

6.12C

What percent of the people surveyed said their favorite pie flavor was apple?​ (a)  

• 12.5%
• 25%
• 50%
• 37.5%

Tags

CCSS.7.SP.A.2

Which statement is supported by the data in the graph?

• 25% of the students chose a poodle as their favorite dog.

• 50% of the students chose a Labrador as their favorite dog.

• 50% of the students chose a beagle or a bulldog as their favorite dog.

• 30% of the students chose a beagle as their favorite dog.

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CCSS.3.MD.B.3

The median of the data set is ​ (a)   and the interquartile range is ​ (b)   .

• 75
• 6
• 85
• 77.5

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6.12C

A bag contained colored tiles. The bag contained 9 red, 6 yellow, 12 blue, and 23 green tiles. Which relative frequency table best represents the data?

• 
• 
• 
• 

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6.12D

Based on the stem and leaf plot, which statement is true?

• The mode of the data is $0.25.

• The mode of the data is $0.75

• The mode of the data is $2.25.

• The mode can not be determined.

Answer explanation

The statement that is true is that the mode is $2.25 because it appears four times in the stem & leaf plot.

Tags

6.13A