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?
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The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $10.
a) Find the probability that a random selected utility bill is between $85 and $125.
b) If 300 utility bills are randomly selected from this city, approximately how many of them will be more than $115.
c) Find a value of the utility bill such that only 5% of utility bills in this city is larger than that.
Given that monthly bills in a city are normally distributed with mean = 100 & SD = 10 . Answer to part a) P(85 < x < 125) = P(X< 125) - P(X < 85) P(X<125) = P(Z < (125-100)/10) = P(Z < 2.5) We refer
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