Response to the following problem:
A quantity is measured 8 times with the following results: 15.653, 15.642, 15.684, 15.629, 15.637, 15.671, 15.658, and 15.663, determine the following:
a. Most probable value of the measured quantity
b. Probable error of a single measurement
c. 90% error
d. 95% error.