The annual gas bill for a town household are considered to be normally distributed with a mean of $ 1130 and a standard deviation of $ 150. If one household is randomly selected, what is the probability that the gas bill will be between $900 and $1100?

The probability is  

Step-by-step explanation:

From the question we are told that

   The  population mean is  

    The standard deviation is  

Generally the probability that the gas bill will be between $900 and  $1100 is mathematically represented as

=>  

Generally

So

From the z  table  

and

So

=>

answer is b

step-by-step explanation:

10 - 8 = -2

  8 - 6 = -2

etc, so -2 is the common difference

step-by-step explanation: