The lifetimes (in years) of five identical machines are

MATHEMATICS · Subjective · A Level · Mathematics · Data presentation and interpretation · Data presentation and interpretation

Problem

The lifetimes (in years) of five identical machines are 14.2,  15.8,  13.9,  14.7,  15.414.2,\;15.8,\;13.9,\;14.7,\;15.4. If their mean lifetime is known to be 14.814.8 years, determine the population standard deviation correct to one decimal place.

Related theory

Browse the problem library