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According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
a. What is the probability that a randomly selected monthly cell phone bill is more than $100?
b. What is the probability that a randomly selected monthly cell phone bill is between $60 and $83?
c. What is the probability that a randomly selected monthly cell phone bill is between $80 and $90?
d. What is the probability that a randomly selected monthly cell phone bill is no more than $55?
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
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Suppose that about 48% of all infants are girls. The maternity ward at a large hospital handles 1000 deliveries per year. A smaller hospital in the same city records about 50 deliveries per year. At which hospital is it more likely that between 46..
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In a normal distribution with mean 3 and variance 49, what are the upper and lower limit scores for the middle 50% of the data?
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