A set of 25 measurement have the following values:
9.4, 10.1, 9.1, 12.3, 10.3, 10.0, 10.5, 9.0, 10.8, 10.0, 11.1, 9.8, 7.6, 9.2, 10.7, 8.4,
11.0, 9.7, 11.3, 8.7, 9.9, 11.5, 10.0, 9.5, 11.9
The mean value and standard deviation of these measurements are xmean ¼ 10.072
and standard deviation (s) ¼ 1.1108.
By applying error function tables to the mean and standard deviation values given,
estimate:
(a) How many measurements are less than 11.05
(b) How many measurements are greater than 9.55
(c) How many measurements are between 9.95 and 10.95
Check your answers against the real data.