5. The laboratories of three organizations measured the pH of the same sample of tap water. The following results were obtained:
Organization number Results of single measurements of water pH
1 5.8; 5.2; 5.4; 5.3; 5.5
2 5.5; 5.1; 5.0; 5.3; 5.0
3 5.4; 5.1; 5.0; 5.7; 5.0
Estimate random measurement errors and, with a probability of 0.95, the presence of gross errors in the given single measurement results. Can the random measurement errors of the three laboratories be considered the same?
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