Statistics, standard deviation and normal distribution HELP?

Anonymous
I need help on the following questions ASAP

1. For a class test we found that the average was 70% and the standard deviation was 8%. If a student had a z-score of 2.1 what was their class test score?

2. The time taken by a group of athletes to run 10km is normally distributed with a mean of 58 minutes and standard deviation of 6 minutes.
a) What is the percentage of athletes that complete the 10km race in more than 70 minutes?
b) Calculate the percentage of athletes that complete the run below 66 minutes.
c) Find the percentage of athletes that complete the run in between 55 and 65 minutes.
Statistics, standard deviation and normal distribution HELP?
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