Suppose that a random variable X is normally distributed with a mean of 200 and a variance of 625. Required: a) What proportion of X-values lies between 180 and 195? b) Below what value do 33 per cent...

Suppose that a random variable X is normally distributed with a mean of 200 and a variance of 625.
Required:
a) What proportion of X-values lies between 180 and 195?
b) Below what value do 33 per cent of X-values lie?
c) What proportion of X-values are more than 190?
d) What proportion of X-values are less than 195?