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Why is the standard normal distribution important in statistical analysis? Can some one help me with this? i can't seem to get this.

"Is it Estimated that 18% of the cars registered in the state cant meet the states new air pollution exhaust system standards. If there are 965,425 cars registered in the state, what is the average number of cars in the state that will not pass the new air pollution? what is the variance? What...

I did some problems for homework and these are the only ones i could not get. Thank you in advance. 1. How many Different 7 digit phone numbers are pssobile if the first digit cannot be zero or one.(assume no other restrictions and that repetions are allowed) B. Using the prob above, how many...