# Lengths 6

Lengths of 130 tubes are measured. The arithmetic mean is 17.27 cm, and the standard deviation is 1.2 cm. How many tubes do have a length:

a) between 16.5 cm and 18.1 cm

b) greater than 17 cm

a) between 16.5 cm and 18.1 cm

b) greater than 17 cm

### Correct answer:

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