Hello anyone help me with the Z-transform question:
You draw in a laboratory, the repeated values is a titration normally distributed with mean 8.17 ml and standard deviation 0,04 ml. for each part of a suitable rough diagram.

(a) you will find the 68.3% and 95% confidence interval for this distribution.
(b) find the probability that a titration has a value greater than 8.13 ml.
(c) nine tests were carried out and the sample mean is found. Find the probability that the sample mean is greater than 8.18 ml.

Help would be really appreciate!

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