Length of 7 observations measured constructed at 98 % condence interval for a mean value and variance of their height, assuming that the length comes from a normal distribution. N(, o), both parameters unknown. 98 % CI for u in cm: (c; 115.699) 98% Cl for o in cm : (d; 368.998) The length of the first six observations in centimeters is: 118.1, 113.0, 109.7, 106.0, 104.3, and 101.9. Determine missing values of lower bounds of the confidence intervals c ER and d E R. What is the length of last observation?