You have made 5 determinations of the distance and obtained the values

10,505 10,498 10,500 10,502 10,509

a) Interval tax with the confidence level 99%, provided that the measured values are normally distributed with as the waiting value.

b) Now someone says: "In fact, there is a systematic error (bias), which is +0.01, in the measurement method. How do you report the interval and degree of confidence taking this into account?