Repeat readings, means and anomalies

Question 1

A group measured the time for a ball to roll down a ramp three times: 27, 24 and 26 s. What is the mean? Give your answer to 1 decimal place.

Answer s

Question 2

Four repeat readings of the temperature rise in a reaction (°C): 19, 9, 21, 17. Which reading is anomalous (does not fit the pattern)?

• A. 9
• B. 19
• C. 21
• D. 17

Question 3

Four repeat readings of how far a toy car travelled (cm): 87, 85, 86, 45. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer cm

Question 4

A group measured a pulse rate after exercise three times: 112, 112 and 111 bpm. What is the mean? Give your answer to 1 decimal place.

Answer bpm

Question 5

Four repeat readings of the temperature rise in a reaction (°C): 21, 13, 12, 14. Which reading is anomalous (does not fit the pattern)?

• A. 21
• B. 13
• C. 14
• D. 12

Question 6

Four repeat readings of the temperature rise in a reaction (°C): 12, 11, 21, 11. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer °C

Question 7

A group measured the time for a ball to roll down a ramp three times: 26, 28 and 23 s. What is the mean? Give your answer to 1 decimal place.

Answer s

Question 8

Four repeat readings of the time for a ball to roll down a ramp (s): 29, 28, 44, 27. Which reading is anomalous (does not fit the pattern)?

• A. 44
• B. 29
• C. 28
• D. 27

Question 9

Four repeat readings of the time for a ball to roll down a ramp (s): 37, 37, 56, 37. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer s

Question 10

A group measured the time for a ball to roll down a ramp three times: 32, 34 and 33 s. What is the mean? Give your answer to 1 decimal place.

Answer s

Question 11

Four repeat readings of the temperature rise in a reaction (°C): 16, 24, 17, 16. Which reading is anomalous (does not fit the pattern)?

• A. 24
• B. 16
• C. 17

Question 12

Four repeat readings of a pulse rate after exercise (bpm): 138, 203, 139, 136. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer bpm

Question 13

A group measured the temperature rise in a reaction three times: 13, 13 and 12 °C. What is the mean? Give your answer to 1 decimal place.

Answer °C

Question 14

Four repeat readings of how far a toy car travelled (cm): 72, 73, 71, 43. Which reading is anomalous (does not fit the pattern)?

• A. 43
• B. 73
• C. 71
• D. 72

Question 15

Four repeat readings of a pulse rate after exercise (bpm): 106, 105, 108, 66. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer bpm

Question 16

A group measured how far a toy car travelled three times: 90, 92 and 89 cm. What is the mean? Give your answer to 1 decimal place.

Answer cm