Please help me to solve below homework A random variable is normally distributed with a mean of 15 and a standard deviation of 3. If an observation is randomly selected from the​ distribution, a. What...

Please help me to solve below homework

A random variable is normally distributed with a mean of 15 and a standard deviation of 3. If an observation is randomly selected from the​ distribution, a. What value will be exceeded 20​% of the​ time? b. What value will be exceeded 95​% of the​ time? c. Determine two values of which the smaller has 15​% of the values below it and the larger has 15​% of the values above it. d. What value will 5​% of the observations be​ below?