Working Scientifically- Calculating Averages 1

A scientist measures the temperatures of a chemical reaction at five different times: 85°C, 92°C, 78°C, 95°C, and 80°C. What is the average temperature during the reaction?

• 86°C

• 88°C

• 84°C

• 90°C

Tags

NGSS.MS-PS3-4

A scientist records the growth of a plant over 5 weeks, measuring heights of 12 cm, 15 cm, 13 cm, 14 cm, and 11 cm. What is the average weekly growth?

• 13 cm

• 12.5 cm

• 13.5 cm

• 14 cm

A scientist records the growth of a plant over five days as 5 cm, 7 cm, 6 cm, 8 cm, and 4 cm. What is the average daily growth?

• 6 cm

• 5 cm

• 7 cm

• 6.5 cm

A scientist measures the height of five different plant species: 10 cm, 12 cm, 8 cm, 15 cm, and 11 cm. What is the average height of these plants?

• 11.2 cm

• 10 cm

• 12 cm

• 13 cm

A scientist uses 3 liters of a chemical solution for one experiment. How many liters does she need for 5 experiments?

• 15 liters

• 10 liters

• 20 liters

• 12 liters

A scientist records the temperature of a chemical solution at five different times: 22°C, 25°C, 23°C, 27°C, and 21°C. What is the average temperature of the solution?

• 23°C

• 24°C

• 22°C

• 25°C

A scientist observes the growth of a bacterial colony in a petri dish every hour: 10, 20, 40, 80, and 160. What is the average number of bacteria observed per hour?

• 62 bacteria

• 50 bacteria

• 70 bacteria

• 80 bacteria

A scientist records the mass of four identical metal samples: 50 g, 48 g, 52 g, and 50 g. What is the average mass?

• 50 g

• 49 g

• 51 g

• 52 g

A scientist conducts an experiment to measure the time it takes for a chemical reaction to complete in four trials: 2 seconds, 3 seconds, 2 seconds, and 1 second. What is the average reaction time?

• 2 seconds

• 1.5 seconds

• 2.5 seconds

• 3 seconds

Tags

NGSS.MS-PS1-2

An ecologist records the heights of five different trees: 3000 ft, 2800 ft, 3200 ft, 3100 ft, and 2900 ft. What is the average height of these trees?

• 3000 ft

• 3050 ft

• 3100 ft

• 2950 ft