(CO 5) The monthly utility bills in a city are normally distributed with a mean of...
(CO 5) The monthly utility bills in a city are normally distributed with a mean of $121 and a standard deviation of $41. Find the probability that a randomly selected utility bill is between $110 and $130.
Homework Answers
Mean = 121
SD = 41
Z = (X - mean) / SD
P(110 < X <130) = P((110-121)/41 < Z < (130-121)/41)
= P(-0.27 < Z < 0.22)
= P(Z < 0.22) - P(Z < -0.27)
= 0.5871 - 0.3936
= 0.1935
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