Can anyone help me with the following questions? My daughter was up all night and I'm not with it today! THANKS!!!!

A normal distribution has a mean of 21.8 and a standard deviation of 1.4. What is the z score for a value of 18.3?

A normal distribution has a mean of 36 and a standard deviation of 3. What is the z score for a value of 42?

For a standard normal distribution, 95% of the data are within _____ standard deviations of the mean.

Using the region under the curve in a standard normal distribution, the cumulative area from the left for a z score of -1.645 is:?