Repeat readings, means and anomalies

Question 1

Four repeat readings of a pulse rate after exercise (bpm): 121, 120, 182, 119. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer bpm

Question 2

A group measured the time for a ball to roll down a ramp three times: 38, 38 and 37 s. What is the mean? Give your answer to 1 decimal place.

Answer s

Question 3

Four repeat readings of the temperature rise in a reaction (°C): 19, 17, 20, 30. Which reading is anomalous (does not fit the pattern)?

• A. 30
• B. 20
• C. 17
• D. 19

Question 4

Four repeat readings of the temperature rise in a reaction (°C): 13, 23, 15, 13. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer °C

Question 5

A group measured how far a toy car travelled three times: 85, 86 and 88 cm. What is the mean? Give your answer to 1 decimal place.

Answer cm

Question 6

Four repeat readings of the temperature rise in a reaction (°C): 16, 28, 18, 14. Which reading is anomalous (does not fit the pattern)?

• A. 28
• B. 16
• C. 14
• D. 18

Question 7

Four repeat readings of the temperature rise in a reaction (°C): -3, 8, 6, 9. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer °C

Question 8

A group measured the time for a ball to roll down a ramp three times: 32, 35 and 30 s. What is the mean? Give your answer to 1 decimal place.

Answer s

Question 9

Four repeat readings of how far a toy car travelled (cm): 82, 83, 83, 51. Which reading is anomalous (does not fit the pattern)?

• A. 51
• B. 83
• C. 82

Question 10

Four repeat readings of how far a toy car travelled (cm): 80, 82, 109, 82. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer cm

Question 11

A group measured the temperature rise in a reaction three times: 19, 17 and 22 °C. What is the mean? Give your answer to 1 decimal place.

Answer °C

Question 12

Four repeat readings of the temperature rise in a reaction (°C): 26, 18, 18, 18. Which reading is anomalous (does not fit the pattern)?

• A. 26
• B. 18

Question 13

Four repeat readings of the temperature rise in a reaction (°C): 12, 12, 13, 24. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer °C

Question 14

A group measured how far a toy car travelled three times: 81, 79 and 83 cm. What is the mean? Give your answer to 1 decimal place.

Answer cm

Question 15

Four repeat readings of how far a toy car travelled (cm): 85, 87, 85, 123. Which reading is anomalous (does not fit the pattern)?

• A. 123
• B. 87
• C. 85

Question 16

Four repeat readings of a pulse rate after exercise (bpm): 68, 138, 138, 136. Leave out the anomalous reading and work out the mean of the rest, to 1 decimal place.

Answer bpm