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1. In a store where the daily sales averages are normally distributed, the mean sales for a product is $75 and the standard deviation is $10. If you want to find out the probability that a randomly picked daily sale of this product is 105 or above, what is the z-value that you should look up on the normal distribution table?
2. 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.
a. What is the probability that a randomly selected monthly cell phone bill is less than $95?
b. What is the probability that a randomly selected monthly cell phone bill is between $62 and $84?
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