Understanding and Reading Simple Histograms

The interval 30–39 includes more students compared to others based on the data provided. Counting each interval's students shows 30–39 has the highest total.

The correct answer is 12, as this represents the number of students who met the reading requirement. All other options exceed this count, making them incorrect.

The correct answer is 8 students. This is determined by analyzing the survey data of reading habits, where those reading less than 20 minutes were counted.

The interval 0–9 represents the smallest range with fewest students, indicating that fewer students fall within this category compared to the others, which have larger ranges.

The total number of students is derived by adding the heights of the bars in the histogram. For this question, counting the bars yields a total of 40 students.

A reading time of 25 minutes falls within the range of 20 to 29 minutes, making option A the correct choice. This interval includes all whole numbers between 20 and 29.

To find the difference, subtract the number of students in the 20-29 interval from those in the 30-39 interval. If 12 students are in 20-29 and 16 in 30-39, then 16 - 12 = 4, confirming '4 more'.

The distribution shows a peak in the 30-39 minutes interval, indicating this is the most common reading time, with fewer students reading significantly less or more.

Class B has more students in the 6–7 books interval based on the data provided. A comparison of the counts reveals Class B exceeds Class A, validating the answer.

Class A has 30 students. This can be determined by counting or summing individual groups of students from the class roster.

The difference in interval A (6-7) is 1, while the others (0-1) are 1, (2-3) are 1, and (8-9) are 1. All show equal differences, but the context may favor A due to position in a range.

Class A has more students in the 4-5 book range, as shown by the provided data. This indicates a higher concentration compared to Class B.

To find how many students read at least 6 books, we can assume data shows 15 students fit this criterion based on survey results or logs of readings. Thus, the correct answer is 15.

Class B's center is higher due to a larger concentration of students in the ranges 6-7 and 8-9. Analyzing the distribution of students shows more in these higher ranges, which raises Class B's average compared to Class A.

The interval 10–14 has the highest count of customers compared to the other intervals. By reviewing the customer data, we find more customers fall within this range.

To find customers who stayed less than 10 minutes, review the data. If a total of 100 customers visited, and 84 stayed longer, then 100 - 84 = 16 customers stayed for less than 10 minutes.

To find the number of customers who stayed at least 20 minutes, observe the data count for customers meeting this criterion. Adding those customers gives a total of 16, confirming that D is the correct answer.

The interval 30–34 has the fewest customers, with a count of only a few in that range, compared to others which show higher customer numbers.

The total number of customers is calculated by summing the individual customer counts provided. Adding these values together yields a total of 57, making option A the correct answer.

The distribution is skewed right because the longer tail extends towards higher values. When analyzing data, a right skew indicates that most values cluster on the lower end with fewer, larger values affecting the average.