Computes the probability of tolerable error for a device D for
blood pressure measuring under the ANSI/AAMI-SP10 standard
for a size-n sample of average errors from a normal
distribution with mean mu and stadard deviation sd.
The maximum error accepted is 0.85,
A tolerable error, according to the ANSI/AAMI-SP10,
is a an error of 10mmHg or
less on a single person, using the average of that person's readings.
Currently, only normally distirbuted errors are handled.
Further choices will be implemented over time.
Fuller details in Chandel, et al. (2022).