The histogram shows the ages of 60 museum visitors in years, using 10-year classes from 0 to 70. The vertical axis counts visitors. How many visitors are in the 30 to 40 class?

A histogram shows heights of 48 tomato seedlings in centimeters, with classes 10 to 15 through 35 to 40. The vertical axis counts seedlings. What is the frequency for 20 to 25 centimeters?

The histogram shows download times for 36 phones in seconds, using 2-second classes from 0 to 12. The vertical axis counts phones. How many phones took 6 to 8 seconds?

A histogram shows rainfall amounts for 52 spring days in millimeters, using 5-millimeter classes from 0 to 30. The vertical axis counts days. How many days are in the 15 to 20 millimeter class?

The histogram shows completion times for 44 math students in minutes, with 5-minute classes from 20 to 50. The vertical axis counts students. What is the frequency for 35 to 40 minutes?

A histogram shows battery lifetimes for 55 toy cars in hours, using 4-hour classes from 0 to 24. The vertical axis counts toy cars. How many toy cars are in the 12 to 16 hour class?

The histogram shows top sprint speeds for 50 soccer players in kilometers per hour, with classes from 12 to 24. The vertical axis counts players. How many players are in the 18 to 20 class?

A histogram shows filled water bottle masses for 64 bottles in grams, using 50-gram classes from 200 to 500. The vertical axis counts bottles. What is the frequency for 300 to 350 grams?

The histogram shows page counts for 72 library books, using 50-page classes from 100 to 400. The vertical axis counts books. How many books are in the 250 to 300 page class?

A histogram shows commute distances for 45 employees in kilometers, with 5-kilometer classes from 0 to 30. The vertical axis counts employees. How many employees commute 15 kilometers or more?

The histogram shows daily screen times for 38 students in hours, using 1-hour classes from 0 to 6. The vertical axis counts students. How many students had less than 3 hours?

A histogram shows package masses for 60 parcels in kilograms, using 2-kilogram classes from 0 to 12. The vertical axis counts parcels. How many parcels have mass 8 kilograms or more?

The histogram shows quiz scores for 40 students in points, using 10-point classes from 50 to 100. The vertical axis counts students. How many students scored below 70 points?

A histogram shows cycling distances for 54 riders in kilometers, with 10-kilometer classes from 0 to 60. The vertical axis counts riders. How many riders traveled 30 kilometers or more?

The histogram shows plant growth for 42 bean plants in centimeters, using 4-centimeter classes from 0 to 24. The vertical axis counts plants. How many plants grew less than 12 centimeters?

A histogram shows wait times for 50 clinic patients in minutes, using 5-minute classes from 0 to 25. The vertical axis counts patients. How many patients waited 10 minutes or more?

The histogram shows backpack masses for 46 students in kilograms, using 2-kilogram classes from 0 to 12. The vertical axis counts students. How many backpacks weigh less than 6 kilograms?

The histogram shows weights of 50 dogs in kilograms. What is the class width?

A histogram shows ages of 42 orchard trees in years. What is the class width?

A histogram shows fish lengths for 48 trout in centimeters. What is the class width?

The histogram shows video lengths for 36 student projects in minutes. Which interval is the fourth bar from the left?

A histogram shows school commute distances for 48 students in kilometers. What is the class width?

The histogram shows seed masses for 35 packets in grams. Which class starts at 20 grams?

A histogram shows river depths for 32 sites in centimeters. What is the upper boundary of the third class?

A histogram of call durations uses classes 0 to under 5 minutes, 5 to under 10, 10 to under 15, and 15 to under 20. A call lasts exactly 10.0 minutes. Which bar holds it?

A shipping histogram uses mass classes 0 to under 2 kilograms, 2 to under 4, 4 to under 6, and 6 to under 8. A package has mass 4.0 kilograms. Which class contains it?

A test-score histogram uses classes 50 to under 60 points, 60 to under 70, 70 to under 80, and 80 to under 90. A student scores exactly 70 points. Which class contains the score?

A water-temperature histogram uses classes 12 to under 16 °C, 16 to under 20, 20 to under 24, and 24 to under 28. A reading is 19.9 °C. Which bar holds it?

A histogram of plant heights uses classes 0 to under 10 centimeters, 10 to under 20, 20 to under 30, and 30 to under 40. A plant is exactly 30.0 centimeters tall. Which class contains it?

A race-time histogram uses classes 8 to under 10 seconds, 10 to under 12, 12 to under 14, and 14 to under 16. A runner's time is 9.99 seconds. Which class contains it?

A biologist has 48 leaf lengths running from 21 millimeters to 69 millimeters and wants 6 equal-width classes to cover the full span. What class width should be used?

A lab records 72 reaction times from 180 milliseconds to 420 milliseconds and wants 8 equal-width classes covering the full range. What class width should the histogram use?

A fish hatchery has masses from 105 grams to 285 grams and plans 6 equal-width histogram classes. What class width covers the full span?

A city tracks 50 air-quality readings from 12 to 87 index points and wants 5 equal whole-number classes covering the span. What class width should be used?

A survey has 64 commute distances from 1 kilometer to 49 kilometers and needs 6 equal-width classes. What class width covers the full span?

A teacher records quiz scores: 62, 78, 71, 95, 88, 67, 73, 81, 69, 90. A histogram uses classes 60 to 69, 70 to 79, 80 to 89, and 90 to 99. How many scores are in 70 to 79?

A gardener measures plant heights in centimeters: 18, 22, 25, 27, 31, 35, 36, 39, 41, 43, 48, 52. Classes are 15 to 24, 25 to 34, 35 to 44, and 45 to 54. How many heights are in 35 to 44?

A courier lists delivery times in minutes: 4, 7, 12, 15, 18, 21, 22, 27, 29. A histogram uses classes 0 to under 10, 10 to under 20, and 20 to under 30. How many times are in 20 to under 30?

A club records daily water use in liters: 31, 38, 42, 47, 49, 53, 58, 61, 66, 72. Classes are 30 to 39, 40 to 49, 50 to 59, 60 to 69, and 70 to 79. How many values are in 40 to 49?

A coach records pulse rates: 58, 62, 65, 68, 71, 74, 76, 81, 84, 87, 90, 94. Histogram classes are 50 to 59, 60 to 69, 70 to 79, 80 to 89, and 90 to 99. How many rates are in 80 to 89?