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The regular price of a shirt at a store is $11.70. The sale price of the shirt is 80% less than the regular price, and the sale price is 30% greater than the store’s cost for the shirt. What was the store’s cost, in dollars, for the shirt?

The list gives the mass, in grams, of 5 ruffed lemurs.
3,910, 3,910, 3,430, 3,950, 3,450
What is the mean mass, in grams, of these 5 ruffed lemurs?

Scientists collected acorns that each housed a colony of a particular ant species and then analyzed each colony's structure. For these colonies, the table summarizes the number of queen ants per colony. For these colonies, what is the median number of queen ants per colony?

A list of 10 data values is shown.
10,14,22,6,24,26,14,8,8,8
What is the mean of these data?

Data set A: 2, 3, 4, 5,5
Data set B: 2, 3, 4, 10
Which of the following statements best compares the means of data set A and data set B?

The table shows the amount of time it took a participant in a study to complete each of 5 tasks. What was the mean time, in minutes, for this participant to complete a task?

The table shows the amount of time it took a participant in a study to complete each of 5 tasks. What was the mean time, in minutes, for this participant to complete a task?

The list gives the speeds, in miles per hour, of 7 serves made by a professional tennis player.
107, 109, 109, 111, 151, 154, 155
What is the mean speed, in miles per hour, of these 7 serves?

Data sets X and Y are summarized in the tables shown, where a, b, and c are positive, consecutive integers and a < b < c. Which statement comparing the means of the data sets is true?

The table shows the frequencies of the values in a data set. Which of the following frequency tables represents a data set with the same mean as this data set?

Data set A and data set B each consist of 23 values. The table shows the frequencies of the values for each data set. Which of the following statements best compares the means of the two data sets?

Ari examined a set of 85 plants. The lightest plant had a mass of 2.8 kilograms kg and the heaviest plant had a mass of 6.2 kg. Chihiro examined the same set of 85 plants and also an additional plant with a mass of 11.6 kg. Which of the following must be true about the set of plants that Ari examined and the set of plants that Chihiro examined?