1-A company of natural products produces a powdered medicine, The companyis interested in estimate the mean diameter of the particles. A simple random sample of 100 particles had a mean diameter of 15.4

m. The process has a reported standard deviation of 1.6

m. The 99% confidence interval for the particle's mean diameter is:

Group of answer choices

(15.086 , 15.714)

(14.988 , 15.812)

(15.083 , 15.717)

(14.68 , 15.92)

2- What percentage of the data falls above a z-score of -2.3?

Group of answer choices

98.9%

1.1%

57.9%

42.1%